Method and apparatus for detecting indication information, and methods and devices for relaying transmission

ABSTRACT

The present disclosure discloses a method for detecting indication information, including: determining a carrier/narrowband position and a time-domain position where indication information is located; in which the indication information is configured to indicate whether a user equipment (UE) monitors a paging message or a downlink control channel that indicates the paging message, on associated one or more paging occasions (POs); and detecting the indication information on the determined carrier/narrowband position and the time-domain position, and determining, according to the indication information, whether to monitor the paging message or the downlink control channel on the one or more POs.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of application Ser. No. 17/149,562,filed Jan. 14, 2021, now U.S. Pat. No. 11,218,967, which is acontinuation of application er. No. 16/626,989, which is the 371National Stage of International Application No. PCT/KR2018/008716, filedJul. 31, 2018, which claims priority to Chinese Patent Application No.201710638659.3, filed Jul. 31, 2017, Chinese Patent Application No.201711122708.4, filed Nov. 14, 2017, Chinese Patent Application No.201711218850.9, filed Nov. 28, 2017, and Chinese Patent Application No.201810074927.8, filed Jan. 25, 2018, the disclosures of which are hereinincorporated by reference in their entirety.

BACKGROUND 1. Field

The present disclosure relates to radio communication systems, andparticularly to a method and apparatus for detecting indicationinformation, and a method and device for relay transmission.

2. Description of Related Art

To meet the demand for wireless data traffic having increased sincedeployment of 4th generation (4G) communication systems, efforts havebeen made to develop an improved 5th generation (5G) or pre-5Gcommunication system. The 5G or pre-5G communication system is alsocalled a ‘beyond 4G network’ or a ‘post long term evolution (LTE)system’. The 5G communication system is considered to be implemented inhigher frequency (mmWave) bands, e.g., 60 GHz bands, so as to accomplishhigher data rates. To decrease propagation loss of the radio waves andincrease the transmission distance, beamforming, massive multiple-inputmultiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna,analog beamforming, and large scale antenna techniques are discussedwith respect to 5G communication systems. In addition, in 5Gcommunication systems, development for system network improvement isunder way based on advanced small cells, cloud radio access networks(RANs), ultra-dense networks, device-to-device (D2D) communication,wireless backhaul, moving network, cooperative communication,coordinated multi-points (CoMP), reception-end interference cancellationand the like. In the 5G system, hybrid frequency shift keying (FSK) andFeher's quadrature amplitude modulation (FQAM) and sliding windowsuperposition coding (SWSC) as an advanced coding modulation (ACM), andfilter bank multi carrier (FBMC), non-orthogonal multiple access (NOMA),and sparse code multiple access (SCMA) as an advanced access technologyhave been developed.

The Internet, which is a human centered connectivity network wherehumans generate and consume information, is now evolving to the Internetof things (IoT) where distributed entities, such as things, exchange andprocess information without human intervention. The Internet ofeverything (IoE), which is a combination of the IoT technology and thebig data processing technology through connection with a cloud server,has emerged. As technology elements, such as “sensing technology”,“wired/wireless communication and network infrastructure”, “serviceinterface technology”, and “security technology” have been demanded forIoT implementation, a sensor network, a machine-to-machine (M2M)communication, machine type communication (MTC), and so forth have beenrecently researched. Such an IoT environment may provide intelligentInternet technology services that create a new value to human life bycollecting and analyzing data generated among connected things. IoT maybe applied to a variety of fields including smart home, smart building,smart city, smart car or connected cars, smart grid, health care, smartappliances and advanced medical services through convergence andcombination between existing information technology (IT) and variousindustrial applications.

In line with this, various attempts have been made to apply 5Gcommunication systems to IoT networks. For example, technologies such asa sensor network, MTC, and M2M communication may be implemented bybeamforming, MIMO, and array antennas. Application of a cloud RAN as theabove-described big data processing technology may also be considered tobe as an example of convergence between the 5G technology and the IoTtechnology.

As described above, various services can be provided according to thedevelopment of a wireless communication system, and thus a method foreasily providing such services is required.

SUMMARY

To meet the requirements of the communication rate and the communicationquality, the terminal and the base station need to perform transmissionthrough the relay technology to ensure the information interactionbetween the terminal and the base station, to improve the coverageexpansion of the cell, the cell capacity, and the uniformization of thecell throughput. Therefore, how to implement relay transmission becomesa key issue.

The present application provides a method for detecting indicationinformation, which includes the following. A determination unit isconfigured to determine a carrier/narrowband position and a time-domainposition where indication information is located, wherein the indicationinformation is configured to indicate whether a user equipment (UE)monitors a paging message or a downlink control channel that indicatesthe paging message on associated one or more paging occasions (POs). Anda detection unit is configured to detect the indication information onthe determined carrier/narrowband position and the time-domain position,and determine, according to the indication information, whether tomonitor the paging message or the downlink control channel on theassociated one or more POs.

By the method of the present application, power saving may beeffectively achieved for user equipments.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a basic flow of a method for detectingindication information according to an embodiment of the presentdisclosure;

FIG. 2 is a schematic diagram of a basic structure of an apparatus fordetecting indication information according to an embodiment of thepresent disclosure;

FIG. 3 is a first schematic diagram of determining a carrier/narrowbandposition of indication information;

FIG. 4 is a second schematic diagram of determining a carrier/narrowbandposition of indication information;

FIG. 5 is a first schematic diagram of determining a time-domainposition of indication information according to a period of theindication information;

FIG. 6 is a second schematic diagram of determining a time-domainposition of indication information according to a period of theindication information;

FIG. 7 is a third schematic diagram of determining a time-domainposition of indication information according to a period of theindication information;

FIG. 8 is a first schematic diagram of determining a time-domainposition of indication information according to a paging position A;

FIG. 9 is a second schematic diagram of determining a time-domainposition of indication information according to a paging position A;

FIG. 10 is a third schematic diagram of determining a time-domainposition of indication information according to a paging position A;

FIG. 11 is a fourth schematic diagram of determining a time-domainposition of indication information according to a paging position A;

FIG. 12 is a fifth schematic diagram of determining a time-domainposition of indication information according to a paging position A;

FIG. 13 is a sixth schematic diagram of determining a time-domainposition of indication information according to a paging position A;

FIG. 14 is a schematic diagram of an exemplary mobile communicationnetwork according to embodiments of the present disclosure;

FIG. 15 is a schematic flowchart of a method for relay transmissionaccording to an embodiment of the present disclosure;

FIG. 16 is a schematic flowchart of another method for relaytransmission according to an embodiment of the present disclosure;

FIG. 17 is a schematic diagram of only an physical uplink shared channelusing a relay in an embodiment of the present disclosure;

FIG. 18 is a corresponding schematic diagram of a first method ofobtaining a scheduling message for uplink transmission by a first UE inEmbodiment 1;

FIG. 19 is a corresponding schematic diagram of a second method ofobtaining a scheduling message for uplink transmission by the first UEin Embodiment 1;

FIG. 20 is a corresponding schematic diagram of a third method ofobtaining a scheduling message for uplink transmission by the first UEin Embodiment 1;

FIG. 21 is a schematic diagram of obtaining a scheduling message by thefirst UE through obtaining two uplink grant messages transmitted by thebase station in Embodiment 1;

FIG. 22 is a schematic diagram of obtaining a scheduling message by thefirst UE through obtaining an uplink grant message transmitted by thebase station in Embodiment 1;

FIG. 23 is a schematic diagram of a relay node forwarding an physicaluplink shared channel of a remote node and forwarding a physicaldownlink shared channel transmission of a base station in an embodimentof the present disclosure;

FIG. 24 is a schematic diagram of a relay node forwarding an physicaluplink shared channel of a remote node and forwarding a physicaldownlink shared channel transmission and a physical downlink controlchannel transmission of a base station in an embodiment of the presentdisclosure;

FIG. 25 is a schematic diagram of the position of the earliestUE-specific search space of physical downlink control channel of UE2and/or the position of the earliest UE-specific search space of physicaldownlink control channel of UE3 after UE1 decodes successfully, being inthe same period with the UE-specific search space of physical downlinkcontrol channel of UE in which the UE1 decodes successfully;

FIG. 26 is a schematic diagram of the position of the earliestUE-specific search space of physical downlink control channel of UE2and/or the position of the earliest UE-specific search space of physicaldownlink control channel of UE3 after UE1 decodes successfully, being inthe different periods from the UE-specific search space of physicaldownlink control channel of UE in which the UE1 decodes successfully;

FIG. 27 is a schematic diagram of relaying of DCIs of UE2 and/or UE3 ata candidate position in a UE-specific search space of UE2 and/or UE3;

FIG. 28 is a schematic diagram of the resource position scheduled by thebase station for the uplink/downlink data transmission is not earlierthan the n subframes after the end position of the earliest UE-specificsearch space of the UE2 and/or the UE3 after the UE1 completes decoding;

FIG. 29 is a schematic diagram of an example of forwarding an uplinkdata;

FIG. 30 is a schematic structural diagram of a device of a first UE inan embodiment of the present disclosure;

FIG. 31 is a schematic structural diagram of a device of a base stationin an embodiment of the present disclosure; and

FIG. 32 is a block diagram of a computing system of a base station or auser equipment in an embodiment of the present disclosure.

FIG. 33 is a diagram illustrating a device according to anotherembodiment of the present disclosure.

DETAILED DESCRIPTION

The present disclosure discloses a method for detecting indicationinformation, so as to effectively achieve power saving for userequipments.

To achieve the above object, embodiments of the present disclosureprovide the following technical solutions:

A method for detecting indication information includes:

determining a carrier/narrowband position and a time-domain positionwhere indication information is located; in which the indicationinformation is configured to indicate whether a user equipment (LTE)monitors a paging message or a downlink control channel that indicatesthe paging message on associated one or more paging occasions (POs); and

detecting the indication information on the determinedcarrier/narrowband position and the time-domain position, anddetermining, according to the indication information, whether to monitorthe paging message or the downlink control channel on the associated oneor more POs.

Preferably, the determining a carrier/narrowband position whereindication information is located includes:

determining that the carrier/narrowband position is a predefinedcarrier/narrowband position; or

determining that the carrier/narrowband position is a carrier/narrowbandwhere the paging message or the downlink control channel is located; or

determining the carrier/narrowband position according to configurationinformation from a base station.

Preferably, the predefined carrier/narrowband position is an anchorcarrier; and/or

the determining the carrier/narrowband position according toconfiguration information from a base station includes: according to theconfiguration information, determining whether the carrier/narrowbandposition is a predefined carrier/narrowband or the carrier/narrowbandwhere the paging message or the downlink control channel is located; ordetermining the carrier/narrowband position configured by the basestation as the carrier/narrowband position where the indicationinformation is located.

Preferably, the determining a time-domain position where indicationinformation is located includes:

determining the time-domain position according to a period of theindication information; and/or

determining a position or a starting position where the downlink controlchannel or the paging message is located, and then determining thetime-domain position according to the position or the starting positionwhere the downlink control channel or the paging message is located.

Preferably, one piece of indication information is present before eachpaging message or each group of paging messages or each downlink controlchannel or each group of downlink control channels; in which each pieceof indication information is configured to indicate whether all UEscorresponding to the paging message or the downlink control channelperform monitoring on a PO or POs corresponding to the UEs; or eachpiece of indication information is configured to indicate whether allUEs corresponding to a group of paging messages or a group of downlinkcontrol channels perform monitoring on a group of POs corresponding tothe UEs.

Preferably, more than one piece of indication information is presentbefore each paging message or each downlink control channel, in whicheach of the more than one piece of indication information is configuredto indicate whether a subset of UEs among a group of UEs correspondingto one piece of paging message or one downlink control channel performmonitoring on a PO or POs corresponding to the subset of UEs.

Preferably, one piece of indication information is present before eachpaging radio frame; in which each piece of indication information isconfigured to indicate whether all UEs corresponding to a paging radioframe perform monitoring on a PO or POs corresponding to the UEscorresponding to the paging radio frame; or each piece of indicationinformation is configured to indicate whether all UEs corresponding to agroup of paging radio frames perform monitoring on a PO corresponding tothe UEs corresponding to the group of paging radio frames.

Preferably, more than one piece of indication information is presentbefore each paging radio frame, in which each piece of indicationinformation is configured to indicate whether a subset of UEs among agroup of UEs corresponding to the paging radio frame perform monitoringon a PO corresponding to the subset of UEs.

Preferably, the time-domain position of the indication information is asystem frame, a subframe and/or a time slot occupied to transmit theindication information.

Preferably, the determining the time-domain position according to aperiod of the indication information includes:

determining a system frame number (SFN) of a start or end system framewhere the indication information is located according to the period ofthe indication information, and then determining subframe positioninformation of the indication information.

Preferably, the determining the time-domain position according to aperiod of the indication information includes:

determining a start or end SFN and/or a start or end subframe positionof the indication information according to the period of the indicationinformation; or

determining the start or end SFN where the indication information islocated according to the period of the indication information, thendetermining the start or end subframe position of the indicationinformation, and determining the time-domain position according to thestart or end SFN and the start or end subframe position; or

determining a SFN where the indication information is located accordingto the period of the indication information, then determininginformation of a subframe actually occupied by the indicationinformation, and then determining the time-domain position according tothe SFN and the information of the subframe actually occupied; or

determining the start or end SFN where the indication information islocated according to the period of the indication information, thendetermining the start or end subframe position of the indicationinformation and the information of the subframe actually occupied by theindication information, and then determining the time-domain positionaccording to the start or end SFN, the start or end subframe positionand the information of the subframe actually occupied.

Preferably, the determining the start or end SFN where the indicationinformation is located according to the period of the indicationinformation includes: determining the start or end SFN according to theperiod of the indication information and an offset configured by thebase station.

Preferably, the determining the start or end subframe position of theindication information according to the period of the indicationinformation includes: determining the start or end subframe positionaccording to the period of the indication information and the offsetconfigured by the base station.

Preferably, the period of the indication information is determinedaccording to a discontinuous reception (DRX) period of paging, or theperiod of the indication information and the DRX period of paging areconfigured independently from each other,

Preferably, the indication information being configured to indicatewhether the UE monitors the paging message or the downlink controlchannel that indicates the paging message on the one or more POsincludes: indication information that is located before a PO, that has adistance satisfying a guard period to the PO, and that is closest to thePO is configured to indicate whether the paging message or the downlinkcontrol channel is present on the PO or multiple POs subsequent to thePO.

Preferably, when the time-domain position is determined according to theindication information, a time gap between the time-domain position ofthe indication information and a PO position indicated by the indicationinformation is larger than or equal to a predefined guard period.

Preferably, the determining the time-domain position according to theposition or the starting or ending position where the downlink controlchannel or the paging message is located includes:

determining the time-domain position according to the position or thestarting position where the downlink control channel or the pagingmessage is located and time-domain resource information of theindication information; or

-   -   determining subframe position information of the indication        information, and determining the time-domain position according        to the subframe position information and the position or the        starting position where the downlink control channel or the        paging message is located.

Preferably, the determining the time-domain position according to theposition or the starting position where the downlink control channel orthe paging message is located includes:

determining a start or end subframe position of the indicationinformation, and determining the time-domain position according to theposition or the starting position where the downlink control channel orthe paging message is located and the start subframe position; or

-   -   determining information of a subframe actually occupied by the        indication information, and determining the time-domain position        according to the position or the starting position where the        downlink control channel or the paging message is located and        the information of the subframe actually occupied; or    -   determining the start or end subframe position of the indication        information and the information of the subframe actually        occupied by the indication information, and determining the        time-domain position according to the position or the starting        position where the downlink control channel or the paging        message is located, the start or end subframe position and the        information of the subframe actually occupied.

Preferably, the time-domain resource information of the indicationinformation includes one or more pieces of the following information: anumber of repetitions of the indication information, a time durationoccupied by the indication information, and a relative distance betweenthe indication information and the position or the starting positionwhere the downlink control channel or the paging message is located;and/or

the time-domain resource information of the indication information isconfigured to the UE by the base station, or predefined.

Preferably, the number of repetitions of the indication information isdetermined according to a value Rmax configured by the system, and thevalue Rmax is the maximum number of repetitions of a search space of thedownlink control channel.

Preferably, the number of repetitions of the indication information isdetermined according to the maximum number of repetitions of theindication information measured by the UE and/or configured by the basestation.

Preferably, the subframe position information of the indicationinformation is a start or end subframe position of the indicationinformation and/or information of a subframe actually occupied by theindication information.

Preferably, the determining the start or end subframe position of theindication information includes: calculating the start or end subframeposition according to a predefined rule; or the start or end subframeposition of the indication information is a subframe position predefinedor configured by the base station.

Preferably, the information of the subframe actually occupied by theindication information is a downlink valid subframe, or a specifieddownlink invalid subframe.

Preferably, the method further includes: when the UE has a timingoffset, calculating a SFN and a subframe index where the indicationinformation is detected, and according to the SFN and the subframe indexcalculated, performing timing synchronization.

Preferably, the method further includes: measuring a channel statemeasurement value including reference signal receiving power (RSRP) orreference signal receiving quality (RSRQ) or received signal strengthindication (RSSI) of the carrier/narrowband where the indicationinformation is located according to a received channel or a signalcarrying the indication information; and/or

the method further includes: performing channel estimation with thereceived indication information on the carrier/narrowband where theindication information is located; and/or

the method further includes: determining a carrier/narrowband positionand a time-domain position where indication information of a neighboringcell is located, and determining a channel state of the neighboring cellaccording to the received indication information of the neighboringcell.

Embodiments of the present disclosure provide an apparatus for detectingindication information, including: a determination unit and a detectionunit, in which the determination unit is configured to determine acarrier/narrowband position and a time-domain position where indicationinformation is located; in which the indication information isconfigured to indicate whether a user equipment (UE) monitors a pagingmessage or a downlink control channel that indicates the paging messageon associated one or more paging occasions (POs); and

the detection unit is configured to detect the indication information onthe determined carrier/narrowband position and the time-domain position,and determine, according to the indication information, whether tomonitor the paging message or the downlink control channel on theassociated one or more POs.

As can be seen from the above technical solutions, in the presentdisclosure, a carrier/narrowband position and a time-domain positionwhere indication information is located are determined; in which theindication information is configured to indicate whether a UE monitors apaging message or a downlink control channel that indicates the pagingmessage on one or more POs. Then the indication information is detectedon the determined carrier/narrowband position and the time-domainposition, and whether to monitor the paging message or the downlinkcontrol channel on the one or more POs is determined according to theindication information. By introducing the indication information, it isnot necessary to keep on monitoring a downlink control channel ordecoding paging messages, but only monitor a downlink control channeland decoding a paging message when necessary, and thus the power savingof the device is effectively achieved.

To overcome or at least partially solve the technical problem of how toimplement relay transmission, the following technical solutions areparticularly provided.

Embodiments of the present disclosure provide a method for relaytransmission, executed by a first user equipment (UE), including:

receiving configuration information transmitted by a base station,wherein, the configuration information is used for receiving informationof a second UE;

receiving the information of the second UE according to theconfiguration information; and

forwarding the received information of the second UE.

The configuration information includes at least one of the followings:

identify of the second UE, radio network temporary identifier (RNTI)information of the second UE, physical downlink control channelconfiguration information of the second UE, physical downlink controlchannel configuration information of the first UE, shared channelconfiguration information of the first UE, and shared channelconfiguration information of the second UE;

in which, the physical downlink control channel (PDCCH) configurationinformation includes at least one of the followings: a physical downlinkcontrol channel search space type, a maximum repetition number Rmax, astarting subframe, an offset, valid subframes, a downlink controlinformation (DCI) format, and physical downlink control channel resourceconfiguration information;

the shared channel configuration information includes at least one ofthe followings: configuration information of a physical uplink sharedchannel (PUSCH), configuration information of a physical downlink sharedchannel (PDSCH), a transmission mode of the shared channel, referencesignal information, uplink valid subframes, downlink valid subframes,and hybrid automatic repeat requests (HARM) process parameters and acontrol region size within subframe.

Specifically, the receiving the information of the second UE accordingto the configuration information includes:

acquiring the configuration information of a physical downlink controlchannel of the second UE according to the configuration information,monitoring the physical downlink control channel of the second UEaccording to the acquired physical downlink control channelconfiguration information of the second UE, and decoding monitoredinformation to obtain first scheduling information, in which, thescheduling information corresponding to the shared channel of the secondUE is used for indicating reception of the shared channel of the secondUE, in which, the first scheduling information is used for indicatingreception of the shared channel of the second UE;

receiving data information of the second UE according to the firstscheduling information.

Specifically, the receiving the information of the second UE accordingto the configuration information includes:

acquiring the configuration information of physical downlink controlchannel of the first UE according to the configuration information,monitoring the physical downlink control channel of the first UEaccording to the acquired physical downlink control channelconfiguration information of the first UE, and obtaining the firstscheduling information by decoding;

receiving data information of the second UE according to the firstscheduling information.

Specifically, the receiving the data information of the second UEaccording to the first scheduling information includes:

receiving uplink data information of the second UE on the physicaluplink shared channel of the second UE according to the first schedulinginformation; and/or,

receiving downlink data information of the second UE on the physicaldownlink shared channel of the second UE or the physical downlink sharedchannel of the first UE according to the first scheduling information.

Further, the uplink data information of the second UE is transmitted bythe second UE according to control information received from the basestation, or, the uplink data information of the second UE is transmittedby the second UE according to the control information forwarded by thefirst UE.

The forwarding the received information of the second UE includes:

receiving second scheduling information transmitted by the base station,in which, the second scheduling information is used for the first UE toforward the data information of the second UE; and

forwarding the received data information of the second UE according tothe second scheduling information.

Further, the data information of the second UE at the second UE isreceived according to the control information directly received from thebase station, or, the data information of the second UE at the second UEis received according to the control information forwarded by the firstUE.

Specifically, the receiving the second scheduling informationtransmitted by the base station, includes:

monitoring the physical downlink control channel of the second HE and/orphysical downlink control channel of the first UE, and obtaining thesecond scheduling information by decoding.

Specifically, the monitoring the physical downlink control channel ofthe second UE and/or physical downlink control channel of the first UE,and obtaining the first scheduling information and the second schedulinginformation by decoding includes:

monitoring the physical downlink control channel of the second UE and/orthe physical downlink control channel of the first UE, acquiringscheduling information of the shared channel, and determining the firstscheduling information and/or the second scheduling information based onindication information in the scheduling information of the sharedchannel; and/or,

monitoring the physical downlink control channel of the second UE and/orthe physical downlink control channel of the first UE, acquiringscheduling information of the shared channel, determining the firstscheduling information based on the indication information in thescheduling information of the shared channel, and determining the secondscheduling information based on the first scheduling information and anyone of predefined relay transmission configuration information and apredefined mapping relationship; and/or,

monitoring the physical downlink control channel of the second UE and/orthe physical downlink control channel of the first UE, acquiringscheduling information of the shared channel, determining the secondscheduling information based on the indication information in thescheduling information of the shared channel, and determining the firstscheduling information based on corresponding scheduling information forforwarding the data information of the second UE and any one ofpredefined relay transmission configuration information and a predefinedmapping relationship.

The predefined mapping relationship is a mapping relationship betweenscheduling information corresponding to the shared channel of the secondUE and corresponding scheduling information for forwarding the datainformation of the second UE.

Specifically, the monitoring the physical downlink control channel ofthe second UE and/or the physical downlink control channel of the firstUE, and obtaining the first scheduling information and/or the secondscheduling information by decoding includes:

monitoring a UE-specific search space of the first UE and/or aUE-specific search space of the second UE, and performing blinddetection by the RNTI of the first UE and/or the RNTI of the second UE;

if the blind detection succeeds, obtaining the scheduling informationcorresponding to the physical uplink shared channel and/or thescheduling information corresponding to the physical downlink sharedchannel by decoding;

determining the scheduling information being used to schedule the firstUE and/or the second UE, by at least one of an RNTI used for the blinddetection, a corresponding search space for receiving the schedulinginformation, and an information bit carried in the schedulinginformation;

determining the first scheduling information and/or the secondscheduling information based on the determined scheduling informationfor scheduling the first UE and/or the second UE.

Specifically, the monitoring the UE-specific search space of the firstUE and/or the UE-specific search space of the second UE, and performingblind detection by the RNTI of the first UE and/or the RNTI of thesecond UE, includes:

monitoring the UE-specific search space of the first UE, and performingblind detection by the RNTI of the first UE; and/or,

monitoring the UE-specific search space of the first UE, and performingblind detection by the RNTI of the first UE and the RNTI of the secondUE; and/or,

monitoring the UE-specific search space of the first UE and theUE-specific search space of the second UE, and performing blinddetection by the RNTI corresponding to the search space respectively;and/or,

monitoring the UE-specific search space of the first UE and theUE-specific search space of the second UE, and performing blinddetection by the RNTI of the second UE and the RNTI of the first UE ineach UE-specific search space.

Further, the method further includes: when acquiring more than onecorresponding piece of scheduling information for forwarding the datainformation of the second UE and/or more than one piece of schedulinginformation corresponding to the shared channel of the second UE,determining a mapping relationship between the corresponding schedulinginformation for forwarding the shared channel of the second UE and thescheduling information corresponding to each shared channel of thesecond UE according to a predefined mapping rule, wherein the predefinedmapping rule is a mapping rule between the corresponding schedulinginformation for forwarding the data information of the second UE and thescheduling information corresponding to the shared channel of the secondUE.

Specifically, the forwarding the received information of the second UEincludes:

adding a medium access control (MAC) header or radio link control (RLC)header before the received data information of the second UE; and

forwarding the data information of the second UE after adding theheader.

Specifically, the receiving the information of the second UE accordingto the configuration information includes:

acquiring the physical downlink control channel configurationinformation of the second. UE and/or physical downlink control channelconfiguration information of the first UE according to the configurationinformation;

monitoring the physical downlink control channel of the first UE and/orphysical downlink control channel of the second UE according to theacquired physical downlink control channel configuration information ofthe second UE and/or physical downlink control channel configurationinformation of the first UE; and obtaining the DCI of the second UE bydecoding;

in which, the forwarding the received information of the second UEincludes:

forwarding the DCI of the second UE to the second UE on the physicaldownlink control channel of the second UE.

Further, after the receiving the configuration information transmittedby the base station, the method further includes:

deciding whether the control information, which is obtained by decodingaccording to configuration information, is used for scheduling the firstUE and/or the second UE according to at least one of the followinginformation:

information bit carried in the control information, scrambling RNTI ofthe control information, and a search space for decoding the controlinformation.

The contents carried in the information bit includes at least one of thefollowings: identify of the first UE, identify of the second UE, theRNTI of the first UE, the RNTI of the second UE and identificationinformation of a mapping relationship between the first UE and thesecond UE.

Further, the method further includes: when the first UE performsforwarding, changing the forwarded message content and/or informationbits.

Further, the first UE reports at least one of the following capabilitiesto the base station:

capability of receiving on the uplink frequency band or uplink subframe;

capability of transmitting on the downlink frequency band or downlinksubframe;

capability of full-duplex.

Embodiments of the present disclosure provide a method for relaytransmission, including:

transmitting configuration information to a first user equipment (UE) bya base station;

transmitting, by the base station, information of a second UE to thesecond UE through the first UE according to the configurationinformation; and/or,

receiving, by the base station, the information of the second UEforwarded by the first UE according to the configuration information;

in which, the configuration information is used for forwarding theinformation of the second UE at the first UE.

The configuration information includes at least one of the followings:

identify of the second UE, RNTI information of the second UE, physicaldownlink control channel configuration information of the second UE,physical downlink control channel configuration information of the firstUE, shared channel configuration information of the first UE, and sharedchannel configuration information of the second UE;

in which, the physical downlink control channel configurationinformation includes at least one of the followings: a physical downlinkcontrol channel search space type, a maximum repetition number Rmax, astarting subframe, an offset, valid subframes, a downlink controlinformation (DCI) format, and physical downlink control channel resourceconfiguration information;

the shared channel configuration information includes at least one ofthe followings: configuration information of a physical uplink sharedchannel, configuration information of a physical downlink sharedchannel, a transmission mode of a shared channel, reference signalinformation, uplink valid subframes, downlink valid subframes, and HARQprocess parameters and a control region size within subframe.

Specifically, the transmitting, by the base station, the information ofthe second UE to the second UE through the first UE according to theconfiguration information, includes:

transmitting, by the base station, control information and datainformation of the second UE to the second UE through the first UEaccording to the configuration information; or,

transmitting, by the base station, the control information to the secondUE according to the configuration information, and transmitting, by thebase station, the data information of the second UE to the second UEthrough the first UE.

Specifically, the receiving, by the base station, the information of thesecond UE forwarded by the first UE according to the configurationinformation includes:

transmitting, by the base station, the control information of the secondUE to the second UE through the first UE according to the configurationinformation, and receiving, by the base station, the data information ofthe second UE that is forwarded by the first UE; or,

transmitting, by the base station, the control information to the secondUE according to the configuration information, and receiving, by thebase station, the data information of the second UE that is forwarded bythe first UE.

Specifically, the transmitting, by the base station, the datainformation of the second UE to the second UE through the first UEincludes:

transmitting second scheduling information and first schedulinginformation to the first UE on a physical downlink control channel ofthe second UE and/or a physical downlink control channel of the first UEby the base station according to the configuration information, in whichthe first scheduling information is used for indicating reception of theshared channel of the second UE, the second scheduling information isused for the first UE to forward data information of the second UE;

transmitting the data information of the second UE to the second UEthrough the first UE based on the second scheduling information and thefirst scheduling information.

Specifically, the transmitting, by the base station, the controlinformation of the second UE to the second UE through the first UEincludes:

transmitting, by the base station, the control information of the secondUE to the second UE through the first UE on the physical downlinkcontrol channel of the second UE and/or the physical downlink controlchannel of the first UE according to the configuration information.

Specifically, the receiving, by the base station, the data informationof the second UE forwarded by the first UE includes:

transmitting, by the base station, the second scheduling information andthe first scheduling information to the first UE on the physicaldownlink control channel of the second UE and/or the physical downlinkcontrol channel of the first UE according to the configurationinformation, in which the first scheduling information is used forindicating reception of the shared channel of the second UE, the secondscheduling information is used for the first UE to forward datainformation of the second UE;

receiving the data information of the second UE that is forwarded by thefirst UE based on the second scheduling information and the firstscheduling information.

The method further includes: the base station indicates schedulinginformation transmitted in the physical downlink control channel is usedfor scheduling the first UE and/or scheduling the second UE, by using atleast one of the following manners:

scrambling the physical downlink control channel by using the RNTI inthe configuration information;

transmitting a DCI on a search space of the first UE and/or a searchspace of the second UE according to the physical downlink controlchannel configuration information of the first UE or the second. UE inthe configuration information;

generating information bits in the DCI carried by the physical downlinkcontrol channel according to a predefined rule, in which the contentcarried in the information bit includes at least one of the followings:an identity of the first UE, an identity of the second UE, RNTI of thefirst UE, RNTI of the second UE, and identification information of amapping relationship between the first UE and the second UE.

Specifically, the receiving, by the base station, the information of thesecond UE that is forwarded by the first UE and/or the information thatis transmitted by the second UE, according to the configurationinformation, includes:

transmitting, by the base station, a DCI to the first UE on the physicaldownlink control channel of the second UE and/or the physical downlinkcontrol channel of the first UE according to the configurationinformation, in which the DCI is the scheduling information used forindicating the second UE to transmit information; and/or,

transmitting, by the base station, a DCI to the second UE on thephysical downlink control channel of the second UE according to theconfiguration information, in which the DCI is the schedulinginformation used for indicating the second UE to transmit information;and/or, receiving, by the base station, the information transmitted bythe second UE according to the scheduling information.

The method further includes: scrambling, by the base station, the uplinkgrant message corresponding to the uplink data of the second UE and/orthe downlink grant message corresponding to the downlink data of thesecond UE by the RNTI of the second UE and/or the RNTI of the first UE;and,

transmitting, by the base station, according to the physical downlinkcontrol channel configuration information, the scrambled uplink grantmessage corresponding to the uplink data of the second UE and/or thescrambled downlink grant message corresponding to the downlink data ofthe second UE in the corresponding physical downlink control channel ofthe second UE and/or the physical downlink control channel of the firstUE, in which, the uplink grant message carries the schedulinginformation corresponding to the uplink data of the second UE, and thedownlink grant message carries the scheduling information correspondingto the downlink data of the second UE.

The method further includes:

transmitting the uplink grant message of the uplink data which is neededto be forwarded by the first UE and/or the downlink grant message of thedownlink data which is needed to be forwarded by the first UE in thephysical downlink control channel of the first UE, according to thephysical downlink control channel configuration information of the firstUE; and/or,

transmitting the uplink grant message of the uplink data which is neededto be forwarded by the first UE and/or the downlink grant message of thedownlink data which is needed to be forwarded by the first UE in thephysical downlink control channel of the second UE, according to thephysical downlink control channel configuration information of thesecond UE,

in which, the uplink grant message carries the scheduling informationindicating the first UE to forward the uplink data, and the downlinkgrant message carries the scheduling information indicating the first UEto forward the downlink data.

The method further includes:

the base station acquires scheduling information for enabling atransmission between the first UE and the second UE by at least one ofthe following ways:

transmitting an uplink grant message of the uplink data service of thesecond UE and/or a downlink grant message of the downlink data serviceof the second UE in the physical downlink control channel of the secondUE;

transmitting an uplink grant message of the uplink data service of thesecond UE and/or a downlink grant message of the downlink data serviceof the second UE in the physical downlink control channel of the firstUE;

transmitting a transmission grant message of a data service between thefirst UE and the second UE in a physical downlink control channel of thefirst UE.

The grant message is scrambled by the RNTI of the first UE or the RNTIof the second UE.

Specifically, performing an uplink reception by scheduling the first UEand/or scheduling the second UE and based on the configurationinformation of the data information and/or the configuration informationof the control information, includes:

receiving the uplink data transmitted by the first UE on the physicaluplink shared channel at the scheduled resource position according tothe scheduling information forwarded by the uplink of the first UE;

in which, performing a downlink transmission by scheduling the first UEand/or scheduling the second UE and based on the configurationinformation of the data information and/or the configuration informationof the control information, includes:

transmitting the downlink data to the first UE through the physicaldownlink shared channel at the scheduled resource position according toreception on the corresponding scheduling information for the downlinkof the first UE.

Embodiments of the present disclosure provide a first UE, including:

a first receiving module, configured to receive configurationinformation transmitted by a base station, in which, the configurationinformation is used for receiving information of a second UE;

the first receiving module is further configured to receive informationof a second UE according to the configuration information; and

a forwarding module, configured to forward the information of the secondUE that is received by the first receiving module.

Embodiments of the present disclosure provide a base station, including:

a transmitting module, configured to transmit configuration informationto a first UE;

the transmitting module is further configured to transmit information ofa second UE to the second UE through the first UE; and

a second receiving module, configured to receive the information of thesecond UE forwarded by the first UE according to the configurationinformation.

The configuration information is information used for forwarding theinformation of the second UE at the first UE.

Embodiments of the present disclosure provide a terminal device,including: a processer; and

a memory, configured to store machine readable instructions that, whenexecuted by the processor, cause the processor to perform the method ofrelay transmission of the first aspect.

Embodiments of the present disclosure further provide a base station,including: a processor; and

a memory configured to store machine readable instructions that, whenexecuted by the processor, cause the processor to perform the method ofrelay transmission of the second aspect.

A first UE and a method of relay transmission are provided according tothe present disclosure. Compared with the prior art, in the presentdisclosure, the first UE receives configuration information transmittedby a base station, in which the configuration information is used forreceiving information of the second UE, receives the information of thesecond UE according to the configuration information, and forwards thereceived information of the second UE, so that a relay node (the firstUE) can be used to perform relay transmission between the base stationand a remote node (the second UE).

A base station and a method of relay transmission is provided accordingto the present disclosure. Compared with the prior art, in the presentdisclosure, the base station transmits configuration information to thefirst UE, and the base station transmits the information of the secondUE to the second UE through a first UE according to the configurationinformation; and/or, the base station receives the information of thesecond UE, forwarded by the first UE according to the configurationinformation, in which, the configuration information is used forforwarding the information of the second UE at the first UE, so that arelay node (the first UE) can be used to perform relay transmissionbetween the base station and a remote node (the second UE).

Additional aspects and advantages of the present disclosure will bepartially appreciated and become apparent from the descriptions below,or will be well learned from the practices of the present disclosure.

Embodiments of the present invention will be described in detailhereafter. The examples of these embodiments have been illustrated inthe drawings throughout which same or similar reference numerals referto same or similar elements or elements having same or similarfunctions. The embodiments described hereafter with reference to thedrawings are illustrative, merely used for explaining the presentinvention and should not be regarded as any limitations thereto.

It should be understood by those skill in the art that singular forms“a”, “an”, “the”, and “said” may be intended to include plural forms aswell, unless otherwise stated, it should be further understood thatterms “include/including” used in this specification specify thepresence of the stated features, integers, steps, operations, elementsand/or components, but not exclusive of the presence or addition of oneor more other features, integers, steps, operations, elements,components, and/or combinations thereof. It should be understood thatwhen a component is referred to as being “connected to” or “coupled to”another component, it may be directly connected or coupled to otherelements or provided with intervening elements therebetween. Inaddition, “connected to” or “coupled to” as used herein may includewireless connection or coupling. As used herein, term “and/or” includesall or any of one or more associated listed items or combinationsthereof.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by thoseskill in the art to which the present invention belongs. It shall befurther understood that terms, such as those defined in commonly useddictionaries, should be interpreted as having a meaning that isconsistent with their meanings in the context of the prior art and willnot be interpreted in an idealized or overly formal sense unlessexpressly so defined herein.

It should be understood by a person of ordinary skill in the art thatterm “terminal” and “terminal apparatus” as used herein compasses notonly apparatuses with a wireless signal receiver having no emissioncapability but also apparatuses with receiving and emitting hardwarecapable of carrying out bidirectional communication over a bidirectionalcommunication link. Such apparatuses can include cellular or othercommunication apparatuses with a single-line display or multi-linedisplay or without a multi-line display; Personal Communication Systems(PCSs) with combined functionalities of speech, data processing,facsimile and/or data communication; Personal Digital Assistants (PDAs),which can include RF receivers, pagers, internet/intranet accesses, webbrowsers, notepads, calendars and/or Global Positioning System (GPS)receivers; and/or conventional laptop and/or palmtop computers or otherapparatuses having and/or including a RF receiver. The “terminal” and“terminal apparatus” as used herein may be portable, transportable,mountable in transportations (air, sea and/or land transportations), orsuitable and/or configured to run locally and/or distributed in otherplaces in the earth and/or space for running. The “terminal” or“terminal apparatus” as used herein may be a communication terminal, aninternet terminal, a music/video player terminal. For example, it may bea PDA, a Mobile Internet Device (MID) and/or a mobile phone with amusic/video playback function, or may be apparatuses such as a smart TVand a set-top box.

Power consumption and battery life is very important for terminals in aninternet of thing (IoT). In a narrowband IoT (NB-IoT) or an enhancedmachine type communication (eMTC) system, the power of terminal devicescan be saved by means of configuring a power saving mode (PSM) or anextended discontinuous reception (eDRX) mode. However, a UE is unable tolisten paging messages during sleep in the PSM mode or the eDRX mode. Insome IoT application scenarios, a UE is required to establish aconnection with a network within a certain period of time afterreceiving a network command. Then the UE that has the requirement cannotbe configured with the PSM mode or the eDRX mode that has a relativelylong period.

In a Rel-15 NB-IoT and an enhanced version of eMTC system, to enable aUE to be paged, and meanwhile to save power, a wake-up or sleepsignal/channel is introduced after study and research. The wake-upsignal/channel is configured to wake up a UE, i.e., a case where the UEneeds to continue to monitor a subsequent MTC physical downlink controlchannel (MPDCCH) that is used to indicate a paging message. The sleepsignal/channel is configured to instruct that a UE may enter into asleep state, i.e., a case where the UE does not need to monitor asubsequent MPDCCH that is used to indicate a paging message.

In a system with multiple carriers, a carrier that transmits asynchronization signal is defined as an anchor carrier, and in a Rel-13system, a paging message is transmitted on the anchor carrier. In aRel-14 NB-IoT system, a method for transmitting paging messages onnon-anchor carriers is introduced. In the eMTC system, multiplenarrowbands are defined, in which a narrowband has 6 physical resourceblocks (PRBs), and the concept of paging narrowband is introduced. Inaddition, in the eMTC system, a downlink control channel for MTC,MPDCCH, is configured to indicate a paging message, and different UEsmay monitor MPDCCHs on different narrowbands. Similarly, in an ongoing5G new radio (NR) system, there is a situation where the bandwidth of aUE is smaller than a system bandwidth, and in this case, multiplebandwidth parts may be defined for a paging channel. For the case ofmultiple carriers or narrowbands or bandwidth part (MVP), it is an issueyet to be solved that how to transmit and receive a wake-up or sleepsignal.

In addition, in long term evolution (LTE) technology, informationexchange occurs between a base station and a terminal device. Since someterminal devices may be located far from the base station, the terminaldevices cannot access to the base station or the signal is poor. To meetthe requirements of the communication rate and the communicationquality, the terminal and the base station need to perform transmissionthrough the relay technology to ensure the information interactionbetween the terminal and the base station, to improve the coverageexpansion of the cell, the cell capacity, and the uniformization of thecell throughput. Therefore, how to implement relay transmission becomesa key issue.

First, the relationship between indication information and a pagingsignal in the present disclosure will be explained. In the presentdisclosure, information transmitted by a wake-up or sleep signal orchannel as mentioned in the background part is referred to as indicationinformation of a paging message, and the indication information may beused to indicate whether a user equipment (UE) needs to monitor thedownlink control channel on one or multiple paging occasions (POs), orthe indication information may be used to indicate whether the UE needsto monitor paging messages on one or multiple POs. In the presentdisclosure, the indication information may be transmitted or carried bya signal (e.g., a waveform, or a sequence) or a channel (e.g., adownlink control channel, or a new synchronization channel). Thedownlink control channel is used to indicate a downlink data channel (aphysical downlink shared channel (PDSCH)) that carries a paging message,and for different systems, the downlink control channel and the downlinkdata channel may be different channels, for example, a downlink datacontrol channel (a physical downlink control channel (PDCCH), anenhanced downlink data control channel (enhanced physical downlinkcontrol channel (EPDCCH)), a MPDCCH, a narrowband downlink controlchannel (narrowband physical downlink control channel (NPDCCH)) or aPDCCH of a NR, etc., or a NPDSCH. The downlink control channel and thePDSCH may be on the same carrier or the same narrowband, or may be ondifferent carriers or different narrowbands, and a carrier or anarrowband that transmits a PDCCH or a PDSCH is referred to as a pagingcarrier or a paging narrowband, which may be defined in standards inadvance, or may be obtained by calculation according to a predefinedmethod. Parameters necessary for the calculation may be configuredthrough radio resource control (RRC). For a carrier or a narrowbandwhere the PDSCH is located, it may be indicated by means of downlinkcontrol information (DCI) besides of the foregoing method.

For different systems, the downlink control channel may be transmittedon a carrier or a narrowband. Thus, in eMTC system, the concept ofpaging narrowband is introduced, and a UE determines a narrowband wherean MPDCCH is located according to the following formula (1), and the UEmonitors the MPDCCH on the narrowband determined:

PNB=floor(UE_ID)/(N*Ns)) mod Nn   (1)

where

N: the number of paging frames in a DRY period

Ns: the number of POs in a paging frame

Nn: the number of paging narrowbands

Nb=N*Ns: the number of POs in a DRX period.

UE_ID/(N*Ns) is to ensure that PNB is independent from pagingframe(PF)/PO.

In a NB-IoT system, a downlink control channel is transmitted on acarrier, and weights on different paging carriers are furtherintroduced. The purpose of introducing the weights is to provide a basestation with enough flexibility to adjust a paging load on each carrier,especially when considering that Rel-13 NB-IoT UE and Rel-14 UE thatdoes not support non-anchor carriers can only receive a paging channelfrom the anchor carrier.

The minimal n that satisfies the following formula is the paging carrierto be monitored by the UE:

floor(UE_ID/(N*Ns)) mod W<W(0)+W(1)+

+W(n)   (2)

where W(i) is a weight on a NB-IoT carrier i, configured through RRC insystem information, W is a sum of weights of all paging carriers, i.e.,W=W(0)+W(1)+

+W(Nn−1), and Nn is the number of paging narrowbands.

FIG. 1 is a flow of a method for detecting indication informationprovided according to an embodiment of the present disclosure, and asshown in FIG. 1, the method includes the following steps.

Step 101, a carrier/narrowband position and a time-domain position whereindication information is located is determined.

The indication information is configured to indicate whether a UE needsto monitor a paging message or a downlink control channel that indicatesthe paging message on associated one or more POs.

Step 102, the indication information is detected on the determinedcarrier/narrowband position and the time-domain position, and accordingto the indication information, whether to monitor the paging message orthe downlink control channel on the associated one or more POs isdetermined.

The present disclosure further provides an apparatus for detectingindication information, and the apparatus may be used to implement theabove method, FIG. 2 is a schematic diagram of a basic structure of theapparatus for detecting the indication information. As shown in FIG. 2,the apparatus includes a determination unit and a detection unit.

The determination unit is configured to determine a carrier/narrowbandposition and a time-domain position where indication information islocated. The detection unit is configured to detect the indicationinformation on the determined carrier/narrowband position and thetime-domain position, and determine whether to monitor the pagingmessage or the downlink control channel on the one or more POs accordingto the indication information.

In the following, the detecting method and the detecting apparatus willbe described in detail.

First, the present disclosure will describe how to determine thecarrier/narrowband position of the indication information.

Method 1: The carrier/narrowband position of the indication informationis predefined, and the UE monitors the indication information on thepredefined carrier/narrowband position.

The predefined carrier may be the anchor carrier.

Method 2: The indication information is transmitted on acarrier/narrowband where a paging message or a downlink control channel(e.g., a PDCCH) is transmitted. The UE may obtain configurationinformation that indicates the carrier/narrowband where the pagingmessage is located from higher layer signaling (e.g., a systeminformation block (SIB) or a UE-specific RRC message), so as todetermine the carrier/narrowband position of the indication information.In addition, the UE may know the carrier where the paging message istransmitted according to an indication from the physical layer (e.g., aPDCCH).

Method 3: the carrier/narrowband position of the indication informationis determined according to configuration information from a basestation. For example, the configuration information from the basestation configures the UE that the indication information is transmittedon a specified carrier/narrowband among multiple carriers/narrowbands.The specified carrier/narrowband may be one or morecarriers/narrowbands. Or, for example, the configuration informationfrom the base station configures the UE to use the Method 1 or theMethod 2 to determine the carrier/narrowband position of the indicationinformation. Preferably, the higher layer signaling may configurewhether the UE only monitors the indication information on the anchorcarrier, or whether monitors the indication information on a non-anchorcarrier. For a configuration method and a calculation method, pleaserefer to those for multi-carrier paging in the NB-IoT or eMTC. Inaddition, the configuration method may be dependent on or independentfrom the configuration method of multi-carrier paging.

The carrier/narrowband position(s) determined using the above methodsmay be on one or more carriers/narrowbands. The indication informationmay indicate whether there is a downlink control channel or a pagingmessage transmitted on POs on multiple carriers/narrowbands or on onecarrier/narrowband. For example, scheduling information of a PDSCH thatcarries a paging message is configured to the UE through semi-staticscheduling, or is predefined in the specification, and in this case, theindication information may indicate whether there is a paging messagetransmitted on POs on multiple carriers/narrowbands or on onecarrier/narrowband; and when the scheduling information of the PDSCHthat carriers the paging message is transmitted to the UE through adownlink control channel, then the indication information may indicatewhether there is a downlink control channel transmitted on POs onmultiple carriers/narrowbands or on one carrier/narrowband. Thescheduling information of the PDSCH may include one or multiple piecesof the following information: an encoding and modulation mode, atransmission block size, a time-frequency resource position, etc. Theindication information may indicate whether a UE or a group of UEs orall UEs (associated to one PO) need to continue to monitor a downlinkcontrol channel.

When the indication information is transmitted only on one carrier(e.g., the anchor carrier), after the UE detects the indicationinformation, if the UE needs to continue to monitor paging message ordownlink control channel(s) on a corresponding PO(s), the UE maycontinue to monitor paging message or downlink control channel(s) on thesame carrier, or one different carriers.

In the following, several detailed examples will be provided.

In Example 1, the Method 1 is used to determine a carrier/narrowbandposition of indication information, and the indication information isconfigured to indicate whether to detect a PDSCH that carries a pagingmessage on one or more POs, and/or indicate a downlink control channel(which is referred to as a PDCCH in the following examples) ofscheduling information thereof. Specifically, as shown in FIG. 3,respective UEs obtain configuration information of a paging carrier or apaging narrowband, and determine that indication information istransmitted on a predefined carrier 1 (e.g., carrier 1 is the anchorcarrier). In this case, the respective UEs will monitor indicationinformation 1 and indication information 2 corresponding to a nextperiod on the carrier 1. If the indication information 1 indicates thatthere is a PDCCH or a PDSCH transmitted on the corresponding PO(s), thenthe UEs continue to monitor the PDCCH or try to decode the PDSCHaccording to a PO rule. If the indication information 1 indicates thatthere is no PDCCH or PDSCH transmitted on corresponding PO(s), then theUEs do not monitor PDCCH or do not decode PDSCH on the correspondingPO(s), but continues to detect indication information on the nexttime-frequency resource position of indication information 2. In thefirst period, if there is a PDCCH that indicates a paging message or aPDSCH that carries a paging channel transmitted on POs of UE1-UE3, thenthe base station uses the indication information 1 to indicate thatthere is a PDCCH or a PDSCH transmitted on the corresponding POs. Fromthe UE aspect, after a UE detects the indication information 1, itcontinues to monitor a PDCCH or try to decode a PDSCH on a correspondingPO(s). To be specific, since the POs of the UE1 and the UE2 are on thecarrier 1, the UE1 and the UE2 continue to monitor their respective POson the carrier 1, and since the POs of the UE3 is on the second carrier,and then after the UE3 detects the indication information 1 on thecarrier I, the UE3 monitors a PDCCH that indicates a paging signal onthe POs corresponding to the carrier 2 or tries to decode a PDSCH on asemi-static scheduling resource. If a UE is a narrowband UE, e.g., aNB-IoT UE, an eMTC UE or a narrowband UE in a NR system, then the UEreturns to a center frequency to a carrier (e.g., the carrier 2) where aPO of it is located, and continues to monitor a PDCCH or tries to decodea PDSCH.

It is to be noted that, in this case, from the base station aspect, aslong as there is a paging message or a downlink control channel thatindicates a paging message transmitted on one of POs related to onepiece of indication information in a DRX period, then the base stationwill transmit the indication information, and then all UEs will be wokenup. In other words, even if a UE detects indication information, the UEwill not certainly detect a downlink control channel (e.g., a PDCCH) orwill not certainly successfully decode a PDSCH.

Example 2, the Method 2 is used to determine a carrier/narrowbandposition of indication information, and the indication information isconfigured to indicate whether there is a downlink control channel thatindicates PDSCH or PDSCH that carries a paging message on one or morePOs. Specifically, as shown in FIG. 4, a UE obtains configurationinformation of a paging carrier or a paging narrowband; determines thatindication information is transmitted on the paging carrier. Assume thatindication information 1 and indication information 3 is transmittedrespectively on two carriers, e.g., a carrier 1 and a carrier 2. Thepaging carrier of a UE1 and a UE2 is the carrier 1, and the pagingcarrier of a UE3 is the carrier 2. In this case, the UE1 and the UE2will monitor the indication information 1 and indication information 2corresponding to the next indication information period on the carrier1, but the UE3 monitors the indication information 3 on the carrier 2.In an example, different carriers have different indicationinformation/channel periods. For example, an indication informationperiod on the carrier 1 is identical to the DRX period, but anindication information period on the carrier 2 is an integer multiple ofthe DRX period, e.g., 2 times. If the indication information indicatesthat there is a PDCCH or a PDSCH that carries a paging channeltransmitted on a corresponding then the UE continues to monitor thePDSCH or try to decode the PDSCH according to a PO rule. Similarly, inthe first DRX period on the carrier 1, as long as there is a PDCCH thatindicates a paging message or a PDSCH that carries a paging channeltransmitted on POs of the UE1 and the UE2, the base station willindicate that the PDCCH that indicates the paging message or the PDSCHthat carries the paging channel is transmitted on a corresponding POthrough the indication information 1. From the UE aspect, after a UEdetects the indication in the indication information 1, the UE continuesto monitor a downlink control channel on a corresponding PO, orcontinues to try to decode a PDSCH on a pre-allocated resource. The UE3monitors the indication information 3 on the carrier 2. In an example,the period of the indication information 3 is relatively long, e.g., twoDRX periods, and the indication information 3 indicates whether there isa PDCCH or PDSCH decoding on two POs in the period 2, and in this case,if the UE3 detects indication information, the indication informationindicates that there is a PDCCH transmitted, or a PDSCH that carries apaging message transmitted on a semi-static scheduling resource on acorresponding PO, then the UE3 needs to detect two POs in its period,and conversely, if the indication information detected indicates thatthere is no PDCCH or PDSCH transmitted on a corresponding PO, then theUE3 will not need to monitor a PDCCH or will not need to try to decode aPDSCH on multiple corresponding POs.

For a system that supports multi-narrowband/multi-carrier paging, thebase station may separately configure information related to theindication information for each carrier, e.g., may configure one or morepieces of the following information: a period, an offset for determininga time-domain position, a transmission duration, the number ofrepetitions, valid subframes.

In the following, how to determine the time-domain position of theindication information will be described.

The time-domain position of the indication information may be determinedaccording to any of the following information:

A. A period of the indication information;

B. A position or a starting position (referred to as a paging positionA) where a downlink control channel that indicates a paging message or aPDSCH that carries a paging message of each LT, or a group of UEs arelocated.

The paging position A of each UE is a definite position, correspondingto a unique system frame number (SFN) and a unique subframe. To bespecific, if a PDSCH is scheduled by a downlink control channel, thenthe paging position A herein refers to a position or a starting positionof a downlink control channel that indicates a paging message; and if aPDSCH is semi-static scheduling, then the paging position A hereinrefers to a position or a starting position where a PDSCH that carries apaging message is located. When a downlink control channel thatindicates a paging message or a PDSCH that carries a paging message isnot repeatedly transmitted, then the paging position A is a positionwhere the downlink control channel that indicates the paging message orthe PDSCH that carries the paging message is located; and when thedownlink control channel that indicates the paging message or the PDSCHthat carries the paging message is repeatedly transmitted, then thepaging position A is a starting position where the downlink controlchannel that indicates the paging message or the PDSCH that carries thepaging message is located.

The base station may configure different methods to determine theposition of the indication information according to differentrequirements and different scenarios.

The time-domain position refers to position information of theindication information in the time domain, and it may be a system frameposition and a subframe position, or may be a time slot position. In thefollowing, the description is based on using the system frame positionand the subframe position as an example.

For the information A, the base station may configure an indicationinformation period, and the UE calculates a SFN where indicationinformation is located according to the indication information period,and then determines subframe position information and symbol positioninformation where the indication information is located. Then the UEdetermines an accurate position of the indication information accordingto the SFN, the subframe position information and the symbol positioninformation.

As shown in FIG. 5, the indication information period may be dependenton the DRX period of paging (e.g., the indication information period isone or several times of the DRX period or is a fraction of the DRXperiod), or independent from it (the indication information period andthe DRX period are configured independently from each other).

Specifically, the system frame of the indication information may becalculated using an existing method of determining a paging frame, i.e.,according to the UE ID. For example, it is determined that a SFN thatsatisfies SFN mod T2=(T2 div N)*(UE_ID mod N2) is the system frame ofthe indication information, where T2 is the indication informationperiod (may be obtained through configuration by the base station), andN2 is the minimum value of the period T2 and nB2. NB2 is a parameterconfigured by a higher layer. For example, nB2 may be: 4T2, 2T2, T2,T2/2, T2/4, T2/8, T2/16, T2/32, T2/64, T2/128, T2/256, T2/512, orT2/1024. In the indication information period T2, since the UE ID ofeach UE is different, indication information for each UE will correspondto a different SFN or a different subframe. As shown in FIG. 5, in anindication information period, different UEs may obtain a time-domainposition where the indication information 2 is located and a time-domainposition where the indication information 3 is located. Preferably, themethod of calculating the system frame of the indication information maybe independent from the UE ID, e.g., SFN mode T2=0. In addition, thesystem frame where the indication information is located may becalculated according to a start offset configured by the system. Thestart offset may be cell-specific, or UE-specific, or UE-group-specific.For example, an SFN that satisfies SFN mod T2=offset is the system frameof the indication information. The offset is a start offset, and a valueof which may be obtained by being configured by an eNB (e.g., throughRRC), or may be predefined, or may be calculated according to a UEand/or a carrier/narrowband ID, etc. Specially, offset=0, or T2-1, orT2-M, where M is a value configured by the base station. :NI may beequal to actual transmission duration of the indication information ormay be equal to the actual transmission duration of the indicationinformation plus one guard period. Therefore, M may be inferred from thetransmission duration of the indication information and/or the guardperiod. In this method, for each period T2, there is a piece ofindication information corresponding to it, as shown by the indicationinformation 1 in FIG. 5. As another example in FIG. 6, the indicationinformation period T2 and the paging DRX period T are the same. In thiscase, it is convenient to define a way of transmitting an absolute SFNand/or a subframe index. In a DRX period, different UEs may havedifferent POs (SFNs and subframe indexes). For example, the POs of theUE1 and the UE2 are different, but in a DRX period, i.e., in anindication information period, they are indicated by means of the samepiece of indication information. The offset may be combined with thefirst method to determine a system frame where the indicationinformation is located. Specifically, the system frame may be determinedby offsetting an offset value based on an SFN calculated using the firstmethod. For example, SFN mod T2=offset+(T2 div N)*(UE_ID mod N2) or SFNmod T2=(T2 div N)*(UE_ID mod N2)−offset.

Through the foregoing method, the SFN of the start system frame wherethe indication information is located may be determined according to theindication information period. During implementation, after other systemframes where the indication information is located are determined, theMethod B in the following may be used to determine a subframe positionwhere the indication information is located, and a method of processingthis situation will be introduced in the Method B.

To keep a low-complexity UE, between the indication information and thepaging position A, i.e., a PO, a certain time gap should be reserved forthe UE to detect the indication information. For indication informationthat does not have a time gap with a PO, the LTE cannot rapidlydetermine whether there is a downlink control channel or a downlink datachannel that carries paging information on a PO following the indicationinformation, and in this case, the PO may be defined to be indicated byprevious one piece (i.e., that is closest to the PO and satisfies theguard period) of indication information. Detailed information is shownin FIG. 7, where since there is not a sufficient guard period (GP)between the indication information 2 and the paging position A1, thenwhether there is a PDCCH on the paging position A1 is indicated by theprevious one piece of indication information 1.

What described above is how to determine a SFN where indicationinformation is located under the circumstance A. In the following, howto determine subframe position information and symbol positioninformation of indication information will be described.

For the circumstance B, a UE may determine a paging position A (a SFNand a subframe) using existing technologies, and then determine atime-domain position where the indication information is locatedaccording to time-domain resource information of the indicationinformation, or according to subframe position information of theindication information. As shown in FIG. 8, the base station will send apiece of indication information before each paging message or beforeeach downlink control channel that indicates a paging message. As shownin FIG. 8, the UE1 and the UE2 calculate their paging positions A, i.e.,POs, according to a predefined rule and a configured parameter, and theindication information 1 and the indication information 3 is applicableto the UE1, and the indication information 2 and the indicationinformation 4 is applicable to the UE2.

Preferably, there are two detailed processing methods:

1. Time-domain resource information of indication information isdetermined, and a time-domain position where the indication informationis located is determined according to a paging position A and thetime-domain resource information of the indication information.

Specifically, the time-domain resource information of the indicationinformation may be: the number of repetitions of the indicationinformation and/or a time duration occupied by the indicationinformation, and/or a time gap between the indication information andthe paging position A. The time-domain resource information may beconfigured by the base station, or may be defined in a protocol. To bespecific, when determining the time-domain position where the indicationinformation is located according to the time-domain resource informationof the indication information and the paging position A, the time-domainposition of the indication information may be determined according tothe number of repetitions of the indication information, the timeduration occupied by the indication information, and the time gapbetween the indication information and the paging position A; or whenthere is not a time gap between the indication information and thepaging position A, the time-domain position where the indicationinformation is located may be determined according to the number ofrepetitions of the indication information and the time duration occupiedby the indication information. The time gap between the indicationinformation and the paging position A may be represented by the numberof downlink valid subframes, or may be represented by the absolutenumber of subframes, or may be the number of downlink valid subframesplus one absolute subframe (time). Further, the subframe may be a timeslot or other time units.

In addition, the number of repetitions of the indication information inthe time-domain resource information may be deduced from the maximumrepetition number Rmax in a search space of a PDCCH that indicates apaging channel. For example, it is predefined that the number ofrepetitions of the indication information is equal to Rmax or Rmax/X,where X may be predefined, e.g., in a protocol. X may be configured bythe base station. In addition, the UE may need to monitor a channel or asignal that carries the indication information possible with one or morenumber of repetitions, and the number of repetitions it needs to monitoror the maximum repetition number may be configured by the base stationor may be specified in the protocol. A detailed design thereof may referto the design of a MPDCCH or NPDCCH search space. Then, the startingposition of the indication information may be determined according tothe maximum repetition number, or different starting positions may beobtained according to different numbers of repetitions.

2. Subframe position information of indication information isdetermined, and then a time-domain position where the indicationinformation is located is determined according to the subframe positioninformation and a paging position A.

It is to be specified that, in the foregoing Method A, the subframeposition information of the indication information also needs to bedetermined, and the subframe position information in the Method 2 may bethe same with the subframe position information in the Method A, andthey may be determined in a same way. Therefore, in the following, theywill be described together.

Specifically, the subframe position information of the indicationinformation may include a start subframe position of the indicationinformation and/or information of a subframe actually occupied by theindication information.

When the subframe position information of the indication informationincludes the start subframe position, the start subframe position may bedetermined in the following ways:

1. The start subframe position of the indication information iscalculated according to a predefined rule.

The UE may calculate the start subframe position that is used totransmit the indication information according to the predefined rile.Specifically, the LIE may continue to use the subframe paging method inthe LTE technologies, and determine the start subframe positionaccording to the UE ID and N2=min(T2, nB2) and a predefined table,specifically: i_s2=floor (UE_ID/N2) mod Ns2, where T2 is the indicationinformation period, nB2 is a parameter configured by the higher layer,and Ns2=max (1, nB2/T2).

An example of the predefined table is shown as follows:

Ns2 when i_s2 = 0 when i_s2 = 1 when i_s2 = 2 when i_s2 = 3 1 9 N/A N/AN/A 2 3 8 N/A N/A 4 9 3 4 9

In an example, the table indicates previous one or x subframes (x is apredefined. integer) of the subframe paging table in LTE.

2. The start subframe position of the indication information isdetermined by being predefined or according to RRC configuration.

*?* Predefined: For example, the start subframe position is fixed to beone or more subframes, e.g., fixed to be a subframe 9 of each odd frame(to avoid a narrowband secondary synchronization signal (NSSS) in theNB-IoT system), or fixed to be subframes 3, 4 and 9, or the firstsubframe of each SFN, i.e., subframe 0.

*RRC configuration: The base station may configure a specific subframenumber. The specific subframe index may be a start subframe position ofthe indication information. A subframe position actually occupied by theindication information may be from the starting position to N′ validsubframes, or N′ continuous subframes, or N′ specific pointers, where N′is the number of subframes occupied for transmitting the indicationinformation, or the number of repetitions.

After the start subframe position is determined according to the aboveMethod, for the Method A, the time-domain position where the indicationinformation is located may be determined by combining the SFN and thestart subframe position; and for the Method. B, the time-domain positionwhere the indication information is located may be determined bycombining the paging position A and the start subframe position, e.g.,determining that a start subframe position that is closest to the pagingposition A before the paging position A and that has a gap enough totransmit the indication information with the start subframe of a PDSCHthat carries the downlink control channel or a downlink control channelas the start subframe position.

3. The SFN of the starting position and the subframe position fortransmitting the indication information may be determined directlyaccording to the indication information period.

For example, (10n_(f)+└n_(s)/2┘)mod T2=0 or (10n_(f)+└n_(s)/2┘)modT2=offset or (10n_(f)+└n_(s)/2┘)mod T2=T2−offset, where n_(f) is an SFNindex, n_(s) is a time slot index, i.e., └n_(s)/2┘ is a subframe index.In the above formulas, the value of offset may be a value configured bythe base station independently, or may be a value calculated accordingto the time-domain resource information of the indication information.For example, the value of offset may be a sum of the transmissionduration (including the number of repetitions) and a gap between theindication information and the paging position A, and may further becalculated according to valid subframes. The method of calculating thesubframe starting position herein may be only applicable to the MethodA, not applicable to the Method B.

The subframe position information of the indication information mayinclude information of a subframe actually occupied by the indicationinformation. When the indication information is transmitted, it may needto be transmitted many times, and during the repeated transmissions,some subframes may not be used to transmit the indication information,and therefore, in some cases, the information of the subframe actuallyoccupied by the indication information also needs to be determined tofinally determine the time-domain position occupied by the indicationinformation.

Specifically, the information of the subframe actually occupied refersto that the indication information only occupies a downlink validsubframe, or that the indication information may only occupy a part ofspecified invalid subframes.

The downlink valid subframe may be defined as that in the existingtechnologies. For example, in the NB-IoT system, the downlink validsubframe may be defined as:

(a) A subframe not used for transmitting NPSS/NSSS/NPBCH/NB-SIB1 andother SIBs;

(b) For an anchor carrier, after the UE receives system informationSIB1, the subframe is configured to be an NB-IoT downlink subframe,i.e., a valid subframe; and

(c) For a non-anchor carrier, the subframe is configured by the higherlayer signaling to be an NB-IoT downlink subframe of the non-anchorcarrier, i.e., a valid subframe.

Based on the foregoing definitions, the indication information is onlytransmitted in a valid downlink subframe which specifically: satisfies(a)+(b) on an anchor carrier, or satisfies (c) on a non-anchor carrier;or the indication information is only transmitted in a part of downlinkinvalid subframes, specifically: the indication information istransmitted in a subframe that satisfies (a) but that is configured tobe invalid on an anchor carrier, or the indication information istransmitted in an invalid subframe on a non-anchor carrier.

The advantage of transmitting the indication information in a part ofdownlink invalid subframes is being able to effectively avoid apotential collision between the transmission of other signals ofprevious versions of UEs the previous versions of UEs are not aware ofthe transmission of the indication information) and the transmission ofthe new indication information. This method is more applicable to aconnected mode.

When the time-domain position where the indication information islocated is determined based on the paging position A according to theMethod B, before each paging position A, there is one piece ofindication information used to indicate whether to perform monitor on acorresponding position. Specifically, the situation may be that onepiece of indication information indicates whether UEs corresponding toone paging position A need to perform monitoring, or may be that onepiece of indication information indicates whether UEs corresponding to agroup of paging positions A need to perform monitoring, or may be thatone piece of indication information indicates whether a subset of UEs ofall UEs corresponding to one paging position A need to performmonitoring. In the following, these situations will be described indetail.

What shown in FIG. 6 may also be implemented using the Method B. Forexample, before a PO of each group of UEs (including the UE1 and theUE2), a piece of indication information is transmitted, and the positionA of the indication information is determined according to a PO positionof the first UE in the group of UEs, i.e., the UE1. In this case, thefirst UE in the group of UEs may be calculated starting from SFN=0. A UEclosest to SFN=0 is the first UE. Specifically, the UEs may bere-divided into Y groups in which each group corresponds to one piece ofindication information. For the case where only one carrier isconfigured, when Y=N*Ns (N*Ns represents the number of POs in each DRXperiod), i.e., an indication signal before each PO; when Y>N*Ns, itindicates that the number of pieces of indication information is largerthan the number of POs in a DRX period, i.e., that multiple pieces ofindication information correspond to one PO, and therefore the UEs ofeach PO should be further grouped; and when Y<N*Ns, it indicates that ina DRX period, multiple POs correspond to one piece of indicationinformation. Especially, when Y=1, i.e., each DRX period only has onepiece of indication information used to indicate all UEs on the carrier.For the case of Y>N*Ns, the method of further re-grouping the UEsdescribed hereinafter may be used to decide the time-domain position ofthe indication information.

For the case of Ns>1, it may be difficult to find an indicationinformation position before each PO, and in this case, the PO mentionedin the above may be replaced with PF, and when performing thecalculation, the number N of PF's in each DRX period may be used toreplace the number of POs, N*Ns. For example, when the parameter nBconfigured by the system is larger than T, nB>T, one piece of indicationinformation may be used to indicate UEs of multiple POs in a PF.

in an example, if Ns=1, for the case of Y<N, the UEs of multiple POsneed to find the position of the same indication information, and amethod of implementation thereof includes:

the group number of the indication information y=UE_ID mod Y.

The position of a PF that is closest to the indication information is (Tdiv N)*floor((UE_ID mod N)/(Y/N))*floor(Y/N). The position of the firstPO of the PF is the paging position A. Then the following methods may beused to determine the time-domain position of the indicationinformation,

For the Method A, it may determine the time-domain position of theindication information by combining the SFN, the start subframe positionof the indication information, and the information of a subframeactually occupied by the indication information. For the Method B, itmay determine the time-domain position of the indication information bycombining the paging position A and the information of the subframeactually occupied by the indication information, or may determine thetime-domain position of the indication information by combining thepaging position A, the start subframe position of the indicationinformation, and the information of the subframe actually occupied bythe indication information.

In the following, two detailed examples of determining the time-domainposition of the indication information according to the paging positionA are provided. As shown in FIG. 9, the UE determines a paging positionA, i.e., an SFN and a subframe where a PO is located, e.g., SFN=m, and asubframe k, and in a case where there is a repetition in a downlinkcontrol channel that indicates a paging message or a downlink datachannel that carries a paging message, the PO is its starting position.Then, the UE determines that the start subframe of the indicationinformation is a subframe k-N, according to the number N of subframesoccupied by the indication information or according to a gap between thestart subframe of the indication information and the paging position A.In practice, a range of subframe indexes may be only 0˜9, and in thiscase, the SFN should be introduced for calculation. For example, theposition of the PO is SFN=m, and the subframe index is k, where k=0,˜,9.The starting position of the indication signal/channel isSFN=m-floor(N/10), and the subframe index is K-N mod 10. The number ofsubframes occupied. by the indication information may be configured bythe base station, or may be predefined in the protocol.

As shown in FIG. 10, the UE determines the paging position A, i.e., theSFN n and the subframe k where the PO is located, and then determinesthat the start subframe of the indication information is a subframe maccording to the number N of subframes occupied by the indicationinformation or according to a gap M between the start subframe of theindication information and the paging position A. In an example, thereare N valid subframes between the subframe m and the subframe k. Inaddition, to keep the low complexity of the UE, and to guarantee thatthe UE can determine whether it needs to decode a PDCCH when a POarrives, a guard period, e.g., a period of a subframe or a period ofseveral symbols may be reserved between the indication information (anend position in case of a repetition) and the paging position A.Especially, when different hardware units are used for PDCCH decodingand indication information detecting, a certain time needs to bereserved to wake up a new hardware unit.

For the TDD system, the indication information may be transmitted in adownlink part of a special subframe DwPTS. compared to an entiresubframe, only a part of signals may be transmitted in the specialsubframe DwPTS. Or the indication information may be punctured or ratematching may be performed for a valid RE.

If a UE is in the idle mode, a channel state information referencesignal (CSI-RS) or a position reference signal (PRS) is transparent tothe UE, i.e., the UE may assume that there is no transmission of CSI-RSand PRS. From the base station aspect, when a CSI-RS and an indicationchannel/signal are transmitted on a same time-frequency resourceposition, the indication channel/signal is punctured, i.e., onlytransmitting the CSI-RS, and not transmitting the indicationchannel/signal. In addition, the base station may avoid transmitting aCSI-RS or a PRS through scheduling, e.g., by configuring a downlinkvalid subframe. If the UE is in the connected mode, then the UE mayconsider that a subframe that is configured with a PRS or a CSI-RS is aninvalid subframe. Or the UE may consider that the indicationchannel/signal may puncture the CSI-RS, or perform rate matching, so asto guarantee the performance.

After determining the subframe position through the above method, the UEmay further determine the position of a symbol where the indicationinformation is located.

Preferably, the symbol may be predefined as all symbols in a subframe,or first 3 OFDM symbols in a subframe. Since in the NB-IoT system, inthe standalone mode, first 3 OFDM symbols of subframes 0, 5 and 9 (evenframes) on an anchor carrier are idle. Therefore, the 3 OFDM symbols maybe used to transmit the indication information/channel.

In the above, the method of determining the time-domain position wherethe indication information is located is described. In addition,provided with the position information of the indication information,when there is an offset in UE timing (out of synchronization), the UEmay obtain the values of the SFN, the subframe, and the symbol bydetecting the indication information. For example, if the UE has knownthat the indication information is transmitted in subframe 0 of SFN mode256=0, after the UE is out of synchronization, the UE may set theposition where the UE successfully detects the indication information asthe SFN in the memory of the UE and/or as a value closest to the valueof the subframe, e.g., the positions of SFN=0 and the subframe 0. Thatis to say, the UE may perform the timing synchronization according tothe indication information and a counter relevant to time in the memoryof the UE.

When performing indication information resource element (RE) mapping,pilot signals should be avoided, e.g., the CRS in the LTE system or theNRS in the NB-IoT system. Since in the idle mode of the NB-IoT, forspecific subframes on an anchor carrier, or for first subframes of eachPO on a non-anchor carrier, it is necessary to assume that there is anNRS, and in other subframes, it is unnecessary to assume that there isan NRS. In this case, the indication information may be mapped to REsthat are previously used to transmit the NRS, i.e., assuming that thereis no NRS transmission. This case may better keep the sequencecorrelation and improve the detection performance. When the format oftransmitting the indication information is a channel, then it is assumedthat NRSs exist in subframes of transmitting the indication information,and the UE needs to use the NRSs to perform channel estimation anddecode the indication channel. In addition, the UE may assume that firstsubframes of the indication channel transmission subframes always exist,and the UE may perform frequency offset estimation through the NRSs.

For the NB-IoT system, the UE may determine the mobility, e.g., cellattach or re-selection, in the idle mode according to channel stateindicators such as RSRP and/or RSRQ and/or RSSI of anchor carriers. Ifthe UE needs only to monitor the indication information or channel on ananchor carrier, then it is easy for the UE to obtain the channel stateof the carrier RSRP. Especially, due to the restriction by the RFcapacity, power boosting is only performed for an anchor carrier, and ifall the UEs monitor indication information on anchor carriers, then aunified rule of mobility management may be used, e.g., using a same RSRPthreshold, to perform the cell attachment or re-selection. For example,in the NB-IoT system, the mobility management in the idle state isdecided according to the channel state of the anchor carrier. Similarly,the indication information may be used for communication systems such aseMTC, NR, LTE. In another aspect, since power boosting may be perform onan anchor carried/narrowband, then the signal performance of theindication information on an anchor carrier/narrowband is better thanthat on a non-anchor carrier/narrowband, e.g., power boosting of 6 dBmay be performed for an anchor carrier/narrowband, then the transmissionduration (the number of repetitions, or the time-frequency domainresources occupied, or the length of the sequence) needed by theindication information will be shorter, e.g., only ¼ length is needed.In this way, it is advantageous for power saving of the UE. However, onepiece of indication information in this method indicates whether thereis a paging message on multiple carriers, and if the paging service inthe cell is busy, then the UE will be woken frequently, which loses themeaning of power saving. Thus, in case of the paging service being busy,indication information/channel may be transmitted individually on eachcarrier to indicate whether there is a paging message. Preferably, thebase station may configure a period (frequency) of the indicationinformation/channel. When the paging service is not busy, then, a longerperiod may be configured, and when the paging service is busy, a shorterperiod may be configured, even more, the indication information of UEswhich have the same PO may be separated into a group according to UE IDsof the UEs. That is to say, as shown in the above, when the number ofgroups of UEs, Y>N*Ns, it indicates that multiple pieces of indicationinformation correspond to one PO position, and therefore, UEs of a samePO may be further grouped. For example, as shown in FIG. 11, the UEs ofthe same PO are grouped into two groups according to UE IDs of the UEs,corresponding to indication information 1 and indication information 2.A UE calculates its corresponding indication information according toits UE ID.

The base station may configure time-domain resource information formultiple groups of indication information respectively, e.g., the numberof repetitions of the indication information, and/or the time durationoccupied by the indication information, and the time domain gap betweenthe indication information and the paging position A. As shown in FIG.11, a UE determines the positions of the indication information 1 andthe indication information 2 according to time-domain resourceinformation of two indication information. To be specific, for theindication information 1, {transmission duration 1, gap 1 to theposition A} is configured, and for the indication information 2,{transmission duration 2, gap 2 to the position A} is configured. The UEdetermines the starting position 1 of the indication information 1 andthe starting position 2 of the indication information 2. according tothe position A (the position of PO), the gap to the position A, and thetransmission duration, Since there may have some timing offset to thebases station when UE wakes up from the IDLE state and therefore, toavoid detecting an indication signal of another PO(false alarmed), a gapis necessary between every two pieces of indication information, or atleast every two neighboring groups of indication information usedifferent sequences to reduce the probability of a false alarm. Inanother example, the starting position of the indication information 1may be determined according to the gap between the indicationinformation 2 and the PO, the transmission duration of the indicationinformation 2, the gap between the indication information 1 and theindication information 2, and the transmission duration of theindication information 1. However, this method is more complex than theprevious one.

In addition, the method of determining the time-domain position of theindication information performs multiple-group configuration through thebase station, and thus it is applicable to situations of furthergrouping UEs.

In an LTE, eMTC, or NB-IoT system, as described in the foregoing, a UEcalculates a PF and a PO to which it belongs, i.e., the paging positionA in the present disclosure, according to the parameters configured by abase station (e.g., a DRY period, nB, etc).

PF is an SFN satisfying SFN mod T=(T div N)*(UE_ID mod N). N=min(T,nB),where T is a DTX period, and nB is an RRC parameter configured by thebase station.

PO is an i_s satisfying i_s=floor(UE_ID/N) mod Ns, Ns=max(1,nB/T), andthen the PO is obtained by looking up a table.

As described in the foregoing, to reduce the probability of waking up aUE (for paging other UEs), UEs that belong to a same PO may be dividedinto M groups. A UE may first determine a group m, to which the UEbelongs according to a configuration from the base station, and thendetermine a time-domain resource position of an indication signalaccording to the above method. For example, a number of the group may bedetermined according to a UE ID of the UE: m=floor(UE_ID/N*Ns) mod M. Tobe specific, as shown in FIG. 11, if M=2, and N=4, then a UE, a UE ID ofwhich is 0 belongs to a first group of the PO1, and a UE, a UE ID ofwhich is 4 belongs to a second group of the PO1, and a UE, a UE ID ofwhich is 1 belongs to a first group of the PO2, and a UE, a UE ID ofwhich is 5 belongs to a first group of the PO2, and so on.

For a system that supports multiple carriers/narrowbands, for example:

For an eMTC system PNB=floor(UE_ID/(N*Ns)) mod Nn, where PNB is anarrowband number, Nn is the number of paging narrowbands.

In this case, in the first detailed solution, for UEs that belong to thesame PO, a group number of further grouping ism=floor(floor(UE_ID/N*Ns)/Nn) mod M.

For an NB-IoT system: the paging carrier is a carrier n where n is thesmallest serial number that satisfies floor(UE_ID/(N*Ns)) modW<W(0)+W(1)+

+W(n).

In this case, in the second solution, m=floor(floor(UE_ID/N*Ns)/W) modM.

In addition, besides of transmitting multiple indication signals of asame group of POs on different time-domain positions in sequence,subgroups in each PO may be indicated by configuring multiple sequences,or to obtain a better time-diversity gain, multiple indication signalsmay be transmitted by turns on different time units (e.g., subframes, ora sequence of transmission units). In these two situations, the startingpositions of different indication signals corresponding to one PO may bedecided according to the same parameter or method, and then an actualtime-domain resource position of each indication signal may bedetermined according to a predefined rule (e.g., each subframe, or eachsequence is transmitted by turns). As shown in FIG. 12, the indicationinformation 1 and the indication information 2 are transmitted by turns,and the UE may determine the time-domain starting positions according toconfigurations by the base station, and then determine the time-domaintransmission positions of the indication signals to be monitored. Forthe configuration information of further grouping UEs corresponding to aPO, the base station may perform configuration for each pagingcarrier/narrowband respectively, or may configure a cell-specificparameter. Further, the parameter (including configuration parametersrelevant to the indication signals) may be broadcasted in systeminformation (SIB), or may be configured by UE-specific RRC signaling, orhigher layer non-access stratum (NAS) signaling, or MME.

For the case of Ns>1, it may be difficult to find an indication signalposition before each PO, and then the PO mentioned in the above may bereplaced with PF, and then during the calculation, the number N of PFsin each DRX period is used to replace the number N*Ns of the POs.

Since the transmission of indication information needs to occupyadditional downlink resources, to reduce the downlink resourcesoccupied, whether more resources should be used for paging may bedecided according to whether the paging is successful, and therefore,the idea similar to the PDCCH search space may be supported. That is tosay, the base station may configure an indication information maximumtransmission duration (or a number of repetitions), but an actualtransmission duration may be smaller than the maximum transmissionduration. The UE may determine an assumed duration for detecting theindication information according to a downlink measurement, or theduration used to successfully perform the detection last time. As shownin FIG. 13, the indication information configured by the base stationmay occupy N subframes at most, but only N′ subframes are transmitted.From the UE's aspect, the UE may determine a position to perform thedetection according to a downlink channel state (coverage). To bespecific, if the downlink coverage of the UE is poor, then the UE needsa longer time to perform the detection, and the UE may start to detectan indication signal from a detection position 1 (a maximum transmissionstart position). If the UE is in a good coverage condition, then the UEmay need a shorter time to perform the detection, and it may start thedetection from a detection position 3. The UE may start the detectionfrom a detection position 2, i.e., an actual position where theindication information is transmitted. If the UE performs the detectionstarting from the detection position 1, and a probability ofsuccessfully detecting the indication signal is low, then if the basestation does not receive a random access request from the UE, the basestation may select the maximum transmission duration to transmit theindication information on the next PO, so as to guarantee the detectionperformance. However, compared to a situation where the base stationonly transmits the indication information of N′ substations when takingthe system overhead into consideration, in the present disclosure, a UEwith a poor coverage condition can still possibly detect the indicationsignal successfully.

Besides of the foregoing, to save the time spent by the UE in waking up,an end position where the indication information is actually transmittedmay be fixed, e.g., having a certain time gap (predefined or configuredby the base station through an RRC) with the PO. In this way, if the UEneeds a shorter time to perform the detection, then it may wake up at alater time, which can save more power. In addition, the alignment of theend position may reduce a probability of collision with the transmissionof PDCCH or PDSCH in the previous PO. Under this design, the UE maydetermine the earliest start position that can be used to transmit theindication information according to the maximum transmission duration.UE may determine a position to start the detection when it wakes upaccording to a duration actually needed by the HE to perform thedetection. Specifically, the UE determines the position to start thedetection of the indication information according to the duration neededto perform the detection and a guard period. If the position is presentbefore an earliest possible transmission start position, then the UEperforms the detection starting from the earliest possible transmissionstart position. If the position is present after the earliest possibletransmission start position, then the UE skips the indicationinformation, and directly detects PDCCH. Further, the UE may determinean actual detection position according to information of validsubframes.

In addition, to avoid a mismatch between an actual detection time and anactual transmission time of the UE, some possible transmission durations(e.g., numbers of repetitions) may be predefined. To be specific, thebase station may configure one of transmission durations {1, 4, 8, 16,32, 64, 128} as the maximum transmission duration (or the number ofrepetitions), then the UE may determine a duration needed for an actualdetection according to the possible transmission duration. To bespecific, if the possible transmission duration configured by the basestation is 64, then the UE may select 32 or 48 as the detection durationactually needed by the UE. The value may be one selected from the abovepossible transmission durations, or not.

If the UEs on one PO are divided into two or more groups, as shown inFIG. 11, then a UE that monitors the first indication information needsto calculate a position to perform the detection after the UE wakes up,by counting forwards based on the earliest possible start transmissionposition of the second indication information (according to the durationneeded by the UE to perform the detection). For example, the UE needs todetermine an end position of the first indication information accordingto the earliest possible start transmission position of the secondindication information and a guard gap needed between the two indicationinformation, and then determine the position where the UE starts todetect the indication information according to an actual detection timeneeded by the UE (e.g., determined according to RSRP).

The indication information may be used for channel state measurement andcell synchronization of the UE. Specifically, the HE may obtain ameasurement value of RSRP or RSRQ or RSSI by measuring a channel or asignal such as a CRS signal, and/or an NRS signal, and/or the indicationinformation or channel, and/or a synchronization signal, and/or adownlink broadcast channel (e.g., a PBCH or SIBI) on the carrier. Inaddition, to measure the channel state according to the indicationinformation or channel, the UE needs to obtain a power differencebetween the indication information or channel and other pilot signals.The power difference may be predefined in a protocol, or may beconfigured through RRC signaling. Specifically, the protocol may specifya default value, and may further configure other values through the RRC.In addition, to perform joint measurement, the indication information orchannel may be transmitted through one or more antenna ports. Forexample, the protocol may define that the indication information and asecondary synchronization signal (SSS) or a primary synchronizationsignal (PSS) use the same antenna port, or that the signal or channeland a physical broadcast channel (PBCH) use the same transmission formatand antenna port, or may define the signal or a mapping relationshipbetween the signal and a CRS or an NRS or a DMRS. For a multi-antennasystem, when the indication information is transmitted on differentunits (e.g., different repetitions, different subframes), it may assumeto use different antenna ports. In addition, the signal or channel maybe used to perform channel estimation, to help improve the demodulationperformance of a subsequent downlink channel.

In addition, to support the measurement of a neighboring cell, the basestation may configure indication information of the neighboring cell.The UE may obtain configuration information of the indicationinformation of the neighboring cell, e.g., a time-frequency resourceposition, a period position, a starting position, carrier information,indication information sequence or neighboring cell ID, through systeminformation or other RRC signaling. The HE may obtain the channel statesof neighboring cell(s), e.g., RSRP, RSRQ, RSSI, by measuring indicationinformation of the neighboring cell(s).

In the methods provided in the present disclosure, for the connectedmode and the idle mode, the above methods of calculating the time-domainposition and the carrier position may be the same, or may be different.Different parameters may be configured for the time-domain position andthe carrier position through RRC.

FIG. 14 illustrates an exemplary radio communication system 1400according to embodiments of the present disclosure, where the UEperforms detection for indication information. The radio communicationsystem 1400 includes one or more fixed basic units to form a networkdistributed in a geographic area. The basic unit may be referred to asan access point (AP), an access terminal (AT), a base station (BT), anode B (Node-B), an evolved NodeB (eNB), a next generation NodeB (gNB)or other terminologies. As shown in FIG. 14, one or more basic units1401 and 1402 may provide services for several mobile stations (MSs) orUEs or terminal devices or users 1403 and 1404 in a serving area, e.g.,the serving area is a cell or a cell sector. In some systems, one ormore BSs may be communicatively coupled to a controller that forms anaccess network, and the controller may be communicatively coupled to oneor more core networks. The examples of the present disclosure are notlimited to any specific radio communication system.

In the time domain and/or the frequency domain, the basic units 1401 and1402 may respectively transmit downlink (DL) communication signals 1412and 1413 to UEs 1403 and 1404. The UEs 1403 and 1404 respectivelycommunicate with one or more basic units 1401 and 1402 through uplink(UL) communication signals 1411 and 1414. In an embodiment, the mobilecommunication system 1400 is an orthogonal frequency divisionmultiplexing (OFDM)/orthogonal frequency division multiple access(OFDMA) system that includes multiple base stations and multiple UEs,and the multiple base stations include the base station 1401 and thebase station 1402, and the multiple UEs include the UE 1403 and the UE1404. The base station 1401 may communication with the UE 1403 throughthe uplink link communication signal 1411 and the downlink communicationsignal 1412. When the base station has a downlink packet to betransmitted to the UEs, each UE will obtain a downlink allocation(resource), e.g., a group of radio resources in a physical downlinkshared channel (PDSCH) or a narrowband physical downlink shared channel(NPDSCH). When the UE needs to transmit a packet to the base stationthrough an uplink, the UE may obtain a grant from the base station, andthe grant allocation includes a physical downlink uplink shared channel(PIJSCH) or a narrowband physical uplink shared channel (NPUSCH) of agroup of uplink radio resources. The UE may obtain downlink or uplinkscheduling information from a PDCCH, or an MPDCCH, or an EPDCCH or anNPDCCH specific to the UE. Downlink or uplink scheduling information andother control information carried by a downlink control channel isreferred to as downlink control information (DCI). FIG. 14 further showsdifferent physical channels of the downlink 1412 and the uplink 1411.The downlink 1412 includes a PDCCH or EPDCCH or NPDCCH or MPDCCH 1421, aPDSCH or NPDSCH 1422, a physical control formation indicator channel(PCFICH) 1423, a physical multicast channel (PMCH) 1424, a physicalbroadcast channel (PBCH) or NPBCH 1425, a physical hybrid automaticrepeat request indicator channel (PHICH) 1426 and a primarysynchronization signal (PSS), a secondary synchronization signal (SSS),or a NPSS/NSSS 1427. The downlink control channel 1421 transmits adownlink control signal to a UE. The DCI 1420 is carried on a downlinkcontrol channel 1421. The PDSCH 1422 transmits data information to theUE. The PCFICH 1423 transmits information for decoding a PDCCH, e.g.,dynamically indicating the number of symbols used by the PDCCH 1421, ThePMCH 1424 carries broadcast and multicast information, The PBCH or NPBCH1425 carries a master information block (MB), used for LIE earlydetection and cell-wide coverage. The PHICH carries hybrid automaticrepeat request (HARQ) information, and the HARQ information indicateswhether the base station correctly receives a transmission signal. Theuplink 1411 includes a physical uplink control channel (PUSCH) 1431, aPUSCH 1432, and a physical random access channel (MACH) 1433 thatcarries random access information.

In an embodiment, the radio communication network 100 may use an OFDMAor multi-carrier architecture, including adaptive modulation and coding(AMC) on an uplink and a next generation single-carrier frequencydivision multiple access (FDMA) architecture or multi-carrier orthogonalfrequency division multiple access (OFDMA) architecture used for ULtransmission. The FDMA-based single-carrier architecture includesinterleaved FDMA (IFDMA), localized FDMA (LFDMA), and DFT-spread OFDM(DFT-SOFDM) of IFDMA or LFDMA. In addition, it may further includevarious enhanced NOMA architectures of the OFDMA system, e.g.,PDMA(Pattern division multiple access), SCMA(Sparse code multipleaccess), MUSA(Multi-user shared access), LCRS FDS(Low code ratespreading Frequency domain spreading), NCMA(Non-orthogonal codedmultiple access), RSMA(Resource spreading multiple access),IGMA(Interleave-grid multiple access), LDS-SVE(Low density spreadingwith signature vector extension), LSSA(Low code rate and signature basedshared access), NOCA(Non-orthogonal coded access), IDMA(Interleavedivision multiple access), RDMA(Repetition division multiple access),GOCA(Group orthogonal coded access), WSMA(Welch-bound equality basedspread MA), etc.

In an OFDMA system, mobile units are served by allocating downlink oruplink radio resources of a group of subcarriers on one or more OFDMsymbols. An exemplary OFDMA protocol includes an evolved LTE and IEEE802.16 standard of the 3GPP UMTS standard. The architecture may includea transmission technology, e.g., multi-carrier CDMA (MC-CDMA),multi-carrier direct sequence CDMA (MC-DS-CDMA), and orthogonalfrequency and code division multiplexing (OFCDM). Or, the architecturemay be based on a simpler time and/or frequency divisionmultiplexing/multiple access technology, or a combination of thedifferent technologies.

In the prior art, there are two types of relaying method, including:

The first type of relaying method is a layer 3-based relaying method inwhich a relay node has a base station function. In this method, from theperspective of the node being relayed (it is called a remote node in thepresent disclosure), the identity of the relay node is a base stationwith its own physical cell identity (PCID), which can realize all thefunctions of the base station. From the perspective of the base station,the identity of the relay node is a node. The base station schedules thecommunication resource requests of the relay node and the remote node asthe transmission requests of the uplink and downlink services of therelay node itself, and then the relay node itself further schedulescommunication resources between the relay node and remote node.

The second type of relaying method is a layer 3-based relaying methoddesigned in a device to device (D2D) communication system in a ProximityService (ProSe). In this method, the relay node does not performresource scheduling for the remote node. The relay node itself selectsthe transmission resource on the sidelink (SL) to the remote node, orthe base station schedules the transmission resource on the sidelink forthe relay node, which includes the transmission resources of sidelinkcontrol messages and the resources of sidelink data messages. Thetransmission resources are respectively located in thesidelink-dedicated control resource pool and data resource pool. Thecontrol message transmitted by the relay node indicates the transmissionposition of data message in the data resource pool. Within the coverageof the relay node, the remote node and other non-remote nodes bothmonitor and blindly detect the complete control resource pool (exceptfor the resource position that cannot be intercepted due to thehalf-duplex restriction), determine the corresponding data messagetransmission resource position according to the received control messagecontent, receive the data message at the corresponding resourceposition, and deliver it to the high layer of the node. The high layerof the remote node decodes the destination node information carried inthe data message, and determines itself as the destination node of thedata message; and the high layers of other non-remote node receiving thedata message decode the destination node information carried in the datamessage, determine that itself is not the destination node of the datamessage, and discard the message.

However, the above two types of relay transmission method all belong tolayer 3-based relaying, and they cannot guarantee the service continuitywhen a remote node switches a relay path (for example, switching fromrelay transmission to a direct transmission with the base station, orswitching relay nodes) and performs handover. Neither of the above twomethods is compatible with the physical layer design of existingversions of IoT UEs, therefore, when the existing version of IoT UEs isused as a remote node, neither of the above two methods can implementrelay transmission for a remote IoT node. That is, it is also necessaryto deploy a new version of the IoT UE as the remote node, which greatlyaffects the system cost. In addition, moreover, since a repeat-baseddesign in the IoT system is not supported, the reliability of the linkbetween the relay node and the remote node cannot be ensured, when thelink performance between the relay node and the remote node is poor,especially for the case of the remote IoT with limited transmissioncapability performing uplink transmission.

In addition, the main drawback of the first type of relay transmissionmethod in the prior art is that: the relay node needs to implement thefunctions of the base station, which includes the resource schedulingand high-layer processing mechanisms, thus causing that the complexityis too high and the cost is affected. Moreover, the relay node of basestation type usually has poor support for relay node mobility, causingthat the deployment difficulty and cost thereof are higher than that ofthe relay node of UE type.

The main drawback of the second type of relay transmission method in theprior art is that: the remote node needs to blindly detect the completesidelink control resource pool, but the resource pool may be larger thanthe UE-specific search space of the node, causing that the powerconsumption of the remote node for monitoring and blind detectionincreases, thereby affecting the battery life of remote node andnegatively affecting the core requirements of the IoT system.

To solve the technical problem of relay transmission in the prior art,an embodiment of the present disclosure provides a relay transmissionmethod, including: a method for transmitting a data message and acontrol message through relaying. For a case that the quality of theuplink and/or downlink is poor within the coverage of the cell, it isnecessary to use the remote node with high repetitions. By configuring asuitable relay node for the remote node, a good link quality between theremote node and the relay node is achieved, thereby reducing therepetitions required during transmission and/or reception of the remotenode and greatly saving the power consumption of the remote node;moreover, by using a relay node with a stronger UE capability, thesuccess rate of the transmission is improved, and/or by reducing therepetitions, the utilization efficiency of air interface resources isimproved. For a remote node outside the coverage of cell, by configuringa suitable relay node for the remote node outside the coverage of cell,multi-hop links between the remote node outside the coverage of cellwith the base station can be established for uplink and downlinktransmission, thereby realizing the improvement of the coverage of cell.

Further, compared with the two types of relay method in the backgroundart, the beneficial effects of the present disclosure include that thepresent disclosure does not belong to layer 3-based relaying, and theservice continuity of the remote node can be ensured by an appropriatehigh-layer design. In most application scenarios, the physical layerdesign in this application allows the use of an existing version of theIoT UE as a remote node and has good compatibility with existingdeployments.

FIG. 15 is a schematic flowchart of a method of relay transmissionaccording to an embodiment of the present disclosure, which includes:

Step 1501: the first UE receives configuration information transmittedby a base station; Step 1501: the first UE receives information of asecond UE according to the configuration information; Step 1503: thefirst UE forwards the received information of the second UE.

Wherein, the configuration information is used for receiving theinformation of the second UE.

Wherein, the configuration information includes at least one of thefollowings: identity of the second UE, radio network temporaryidentifier (RNTI) information of the second UE, physical downlinkcontrol channel configuration information of the second UE, physicaldownlink control channel configuration information of the first UE,shared channel configuration information of the first UE, and sharedchannel configuration information of the second UE;

wherein, the physical downlink control channel configuration informationincludes at least one of the followings: a physical downlink controlchannel search space type, a maximum repetition number Rmax, a startingsubframe, an offset, valid subframes, a downlink control information(DCI) format, and physical downlink control channel resourceconfiguration information;

the shared channel configuration information includes at least one ofthe followings: configuration information of a physical uplink sharedchannel, configuration information of a physical downlink sharedchannel, a transmission mode of a shared channel, reference signalinformation, uplink valid subframes, downlink valid subframes, andHybrid Automatic Repeat Request (HARQ) process parameters and a controlregion size within subframe.

Specifically, the receiving the information of the second UE accordingto the configuration information includes:

acquiring the physical downlink control channel configurationinformation of the second UE and/or physical downlink control channelconfiguration information of the first UE according to the configurationinformation, monitoring the physical downlink control channel of thesecond UE and/or physical downlink control channel of the first UEaccording to the acquired physical downlink control channelconfiguration information of the second UE and/or physical downlinkcontrol channel configuration information of the first UE, and obtainingfirst scheduling information by decoding, wherein, the first schedulinginformation is used for indicating the reception of the shared channelof the second UE; receiving data information of the second UE accordingto the first scheduling information.

Specifically, the receiving, by the first UE, data information of thesecond UE, according to the first scheduling information includes:

receiving, by the first UE, uplink data information of the second UE onthe physical uplink shared channel of the second UE, according to thefirst scheduling information; and/or,

receiving, by the first UE, downlink data information of the second HEon the physical downlink shared channel of the second UE or the physicaldownlink shared channel of the first UE, according to the firstscheduling information.

Wherein, the uplink data information of the second UE is transmitted bythe second UE according to control information directly received fromthe base station, or,

the uplink data information of the second UE is transmitted by thesecond UE according to the control information forwarded by the firstUE.

Specifically, the forwarding the received information of the second UEincludes:

receiving second scheduling information transmitted by the base station,wherein, the second scheduling information is used for the first UE toforward the data information of the second UE; and

forwarding the received data information of the second UE according tothe second scheduling information.

Wherein, the data information of the second UE at the second UE isreceived according to the control information directly received from thebase station, or, the data information of the second UE at the second UEis received according to the control information forwarded by the firstUE.

Specifically, the receiving the second scheduling informationtransmitted by the base station, includes:

monitoring the physical downlink control channel of the second UE and/orphysical downlink control channel of the first UE, and,

obtaining second scheduling information by decoding.

Specifically, the forwarding the received information of the second UEincludes:

adding a Medium Access Control (MAC) header or Radio Link Control (RLC)header before the received data information of the second UE; andforwarding the data information of the second after adding the header.

Specifically, the receiving the information of the second UE accordingto the configuration information includes:

acquiring the physical downlink control channel configurationinformation of the second UE and/or physical downlink control channelconfiguration information of the first UE according to the configurationinformation; monitoring the physical downlink control channel of thefirst UE and/or physical downlink control channel of the second UEaccording to the acquired physical downlink control channelconfiguration information of the second and/or physical downlink controlchannel configuration information of the first UE; and obtaining thedownlink control information by decoding;

specifically, the forwarding the received information of the second UEincludes:

forwarding the downlink control information of the second UE to thesecond. UE on the physical downlink control channel of the second UE.

After receiving the configuration information transmitted by the basestation, the method further includes:

deciding whether the control information, which is obtained by decodingaccording to the configuration information, is used for scheduling thefirst UE and/or the second UE according to at least one piece of thefollowing information:

information bit carried in the control information, scrambling RNTI ofthe control information, and a search space for decoding the controlinformation.

Wherein, the content carried in the information bit includes at leastone of the followings: identity of the first UE, identity of the secondUE, the RNTI of the first UE, the RNTI of the second UE andidentification information of a mapping relationship between the firstUE and the second UE.

A method of relay transmission is provided according to the embodimentof the present disclosure. Compared with the prior art, in theembodiment of the present disclosure, the first UE receivesconfiguration information transmitted by a base station, wherein theconfiguration information is used for receiving the information of thesecond UE, receives the information of the second UE according to theconfiguration information, and forwards the received information of thesecond UE, so that a relay node (the first UE) can be used to performrelay transmission between the base station and the remote node (thesecond UE).

FIG. 16 is a schematic flowchart of another method of relay transmissionaccording to an embodiment of the present disclosure, which is executedby a base station, including:

Step 1601: the base station transmits configuration information to afirst UE;

Step 1602: the base station transmits the information of a second UE tothe second UE through the first UE according to the configurationinformation; and/or, the base station receives the information of thesecond UE forwarded by the first UE according to the configurationinformation,

Wherein, the configuration information is used for forwarding theinformation of the second UE at the first UE,

Wherein, the configuration information includes at least one of thefollowings:

identity of the second UE, RNTI information of the second UE, physicaldownlink control channel configuration information of the second UE,physical downlink control channel configuration information of the firstUE, shared channel configuration information of the first UE, and sharedchannel configuration information of the second UE;

wherein, the physical downlink control channel configuration informationincludes at least one of the followings: a physical downlink controlchannel search space type, a maximum repetition number Rmax a startingsubframe, an offset, valid subframes, a DCI format, and physicaldownlink control channel resource configuration information;

the shared channel configuration information includes at least one ofthe followings: configuration information of a physical uplink sharedchannel, configuration information of a physical downlink sharedchannel, a transmission mode of a shared channel, reference signalinformation, uplink valid subframes, downlink valid subframes, andHybrid Automatic Repeat Request (HARQ) process parameters and a controlregion size within subframe.

Specifically, the transmitting, by the base station, the information ofthe second UE to the second UE through the first UE according to theconfiguration information, includes the followings:

transmitting, by the base station, control information and datainformation of the second UE to the second UE through the first UEaccording to the configuration information; or,

transmitting, by the base station, the control information to the secondUE according to the configuration information, and transmitting, by thebase station, the data information of the second UE to the second UEthrough the first UE.

Specifically, the receiving, by the base station, the information of thesecond. UE forwarded by the first UE, according to the configurationinformation, includes:

transmitting, by the base station, the control information of the secondHE to the second UE through the first UE according to the configurationinformation, and receiving, by the base station, the data information ofthe second UE that is forwarded by the first UE; or,

transmitting, by the base station, the control information to the secondUE according to the configuration information, and receiving, by thebase station, the data information of the second UE that is forwardedthrough the first UE.

Specifically, the transmitting, by the base station, the datainformation of the second UE to the second UE through the first UEincludes:

transmitting second scheduling information and first schedulinginformation to the first UE on a physical downlink control channel ofthe second UE and/or a physical downlink control channel of the first UEby the base station according to the configuration information, whereinthe first scheduling information is used for the first UE to receive thedata information of the second UE, the second scheduling information isused for the first UE to forward the data information of the second UE;transmitting the data information of the second UE to the second UEthrough the first UE based on the second scheduling information and thefirst scheduling information.

Specifically, the transmitting, by the base station, the controlinformation of the second UE to the second UE through the first UEincludes: transmitting, by the base station, the control information ofthe second UE to the second UE through the first UE on the physicaldownlink control channel of the second UE and/or the physical downlinkcontrol channel of the first UE according to the configurationinformation.

Specifically, the receiving, by the base station, the data informationof the second UE forwarded through the first UE includes: transmitting,by the base station, the second scheduling information and the firstscheduling information to the first UE on the physical downlink controlchannel of the second UE and/or the physical downlink control channel ofthe first UE according to the configuration information, wherein thefirst scheduling information is used for indicating the reception of theshared channel of the second UE, the second scheduling information isused for the first UE to forward the data information of the second UE;receiving the data information of the second UE that is forwardedthrough the first UE based on the second scheduling information and thefirst scheduling information.

A method of relay transmission is provided according to the embodimentof the present disclosure. Compared with the prior art, in theembodiment of the present disclosure, the base station transmitsconfiguration information to the first UE, and the base stationtransmits the information of a second UE to the second UE through afirst UE according to the configuration information; and/or, the basestation receives the information of the second UE forwarded by the firstUE according to the configuration information, wherein, theconfiguration information is used for forwarding the information of thesecond UE at the first so that a relay node (the first UE) can be usedto perform relay transmission between the base station and a remote node(the second UE).

An embodiment of the present disclosure provides a relaying method thatis not based on layer 3. The contents of this embodiment of the presentdisclosure include a relaying of a physical uplink shared channel, arelaying of a physical downlink shared channel, and a relaying of aphysical downlink control channel.

In the embodiment of the present disclosure, the first UE may be a relaynode with capability of relaying within the coverage of cell, and thesecond UE may be a remote node within the coverage of cell or outsidethe coverage of the cell. The relay node monitors the physical downlinkcontrol channel transmitted by the base station, directly or indirectlyacquires the scheduling information of the physical uplink sharedchannel of the remote node, the scheduling information of the physicaldownlink shared physical, the scheduling information of the relay nodeforwarding the physical uplink shared channel of the remote node, andthe scheduling information of the relay node forwarding physicaldownlink shared channel of the remote node. The uplink transmissionand/or downlink reception between the relay node and the base stationand the transmission and/or reception between the relay node and theremote node are performed according to the contents of the four parts ofscheduling information. The remote node monitors the physical downlinkcontrol channel transmitted by the base station and/or forwarded by therelay node, and directly acquires the scheduling information of thephysical uplink shared channel of the remote node and/or the schedulinginformation of the physical downlink shared channel and performs uplinktransmission and/or downlink reception according to the contents of thescheduling information. The base station schedules thetransmission/reception between the remote node and the relay node andthe uplink transmission/downlink reception between the relay node andthe base station through the physical downlink control channel directlytransmitted to the relay node and/or the physical downlink controlchannel directly transmitted or relayed to the remote node through relaynode, and performs uplink reception or downlink transmission accordingto the contents of the scheduling information of the relay node and/orthe contents of the scheduling information of the remote node.

In the embodiment of the present disclosure, each remote node uses onerelay node for relaying; the relay nodes used by multiple remote nodesmay be the same, that is, one relay node may provide relay functions formultiple remote nodes.

The embodiments of the present disclosure are applicable to threeapplication scenarios. In scenario 1, the relay node only forwards thephysical uplink shared channel transmission of the remote node and doesnot forward the physical downlink shared channel transmission of thebase station and the physical downlink control channel transmission ofthe base station. In scenario 2, the relay node forwards the physicaluplink shared channel transmission of the remote node, forwards thephysical downlink shared channel transmission of the base station, anddoes not forward the physical downlink control channel transmission ofthe base station. In scenario 3, the relay node forwards the physicaluplink shared channel transmission of the remote node, the physicaldownlink shared channel transmission of the base station and thephysical downlink control channel transmission of the base station.

The scenario classification method is independent of whetheruplink/downlink transmissions of other signal channels are relayed. Forexample, in the above scenarios, it is all supported that the relay nodedoes not forward the downlink broadcast signals/channels andsynchronization signals/channels of the base station, and the remotenode itself acquires downlink broadcast messages and synchronizationsignals from the base station.

Hereinafter, based on the application scenario type, detaileddescriptions of relay transmission are provided through several specificembodiments. Embodiment 1 is a relay transmission method in thescenario 1. Embodiment 2 is a relay transmission method in scenario 2.Embodiment 3 is a relay transmission method in scenario 3. For specificdetails, see the following embodiments.

Embodiment 1

This embodiment describes a scenario in which a relay node only performsuplink relaying and describes the manners of performing relaytransmission in this scenario from the perspectives of a remote node, arelay node, and a base station, respectively.

(1) For physical uplink data channel/physical uplink shared channel:

The behaviors of the remote node include the following operation steps:

1. The remote node acquires the scheduling information of uplinktransmission from the base station according to the behavior when thereis no relay, including:

the remote node acquires the shared channel configuration informationand physical downlink control channel configuration information from thebase station by a Radio Resource Control (RRC) signaling, monitors theUE-specific search space of the physical downlink control channel of theremote node according to the configuration information, and blindlydetects a candidate set of physical downlink control channels using aRNTI of the remote node, and obtains an uplink grant message transmittedby the base station by decoding, and acquires scheduling information ofthe physical uplink shared channel from the uplink grant message.

2. The remote node transmits an uplink data message to the base station,including:

the remote node transmits a physical uplink shared channel at thescheduled resource position according to the acquired content of thephysical uplink shared channel scheduling information.

The behaviors of the relay node include the following operation steps:

1. the relay node acquires the configuration information of the relaynode and the remote node from the base station, including:

the relay node acquires from the base station by RRC signaling thefollowings: the identity and/or INTI of the remote node, the physicaldownlink control channel configuration information of the relay node andthe remote node, and the shared channel configuration information of therelay node and the remote node.

Wherein, the physical downlink control channel configuration informationof the remote node includes at least one of the followings: a physicaldownlink control channel search space type, a maximum repetition numberRmax, a starting subframe, valid subframes, a DCI format, and a physicaldownlink control channel resource configuration (e.g., a time-frequencyresource position: a narrowband, a carrier, a physical resource block(PRI3), a control resource set (CORESET), wherein CORESET configurationparameters include: an activation or release of CORESET, timinginformation, an ID, a frequency domain position, a start symbol, aduration, a resource element group (REG), a mapping type from controlchannel element (CCE) to REG, a precoder granularity, an interleavercolumn, an offset index, transmission configuration indication (TCI)state identification, demodulation reference signal (DMRS), a scramblingID).

Wherein, the shared channel configuration information of the remote nodeincludes at least one of the followings: configuration information ofphysical uplink and/or physical downlink shared channel, transmissionmode of the shared channel (e.g., transmission modes 1 to 9), referencesignal information, uplink valid subframes and/or downlink validsubframes, hybrid automatic repeat request (HARQ) process parameters,and a control region size within subframe.

Wherein, when the relay node has the capability of downlink reception inan uplink frequency band or an uplink subframe, the UE-specific searchspace of the physical downlink control channel of the relay node may beconfigured to be on the uplink carrier or the uplink subframe by thebase station.

2. The relay node acquires scheduling information of uplink transmissionof the remote node from the base station, including:

the relay node monitors the UE-specific search space of the physicaldownlink control channel of the remote node according to theconfiguration information of the remote node, blindly detects thecandidate set of the physical downlink control channels by using theRNTI of the remote node, obtains the uplink grant message of the remotenode transmitted by the base station by decoding, and acquires thescheduling information of the physical uplink shared channel of theremote node from the uplink grant message;

and/or,

the relay node monitors the UE-specific search space of physicaldownlink control channel of the relay node according to theconfiguration information of the relay node, blindly detects thecandidate set of the physical downlink control channels by using theRNTI of the relay node or the RNTI of the relay node and the remotenode, obtains the uplink grant message of the remote node transmitted bythe base station by decoding, and acquires the scheduling information ofthe physical uplink shared channel of the remote node from the uplinkgrant message.

Wherein, when the relay node performs relaying for multiple remotenodes, the relay node monitors in the UE-specific search space of thephysical downlink control channel of all the remote nodes and/or relaynodes, and blindly detects by using the RNTI of relay node and/or allthe remote nodes.

Wherein, the relay node performs blind detection successfully by usingthe RNTI of the relay node in the UE-specific search space of thephysical downlink control channel of the relay node, obtains the uplinkgrant message by decoding, and determines that the uplink grant messageis that to be transmitted to the remote node according to theinformation bits carried in the uplink grant message;

or, the relay node performs blind detection successfully by using theRNTI of the remote node in the UE-specific search space of the physicaldownlink control channel of the relay node, obtains the uplink grantmessage by decoding, and determines the uplink grant message is that tobe transmitted to the remote node according to the RNTI used for blinddetection and/or the information bits carried in the uplink grantmessage;

or, the relay node performs blind detection successfully by using theRNTI of the remote node corresponding to the search space in theUE-specific search space of the physical downlink control channel of theremote node, obtains the uplink grant message by decoding, anddetermines the uplink grant message is that to be transmitted to theremote node according to the UE-specific search space and/or the RNTIused for blind detection and/or the information bits carried in theuplink grant message.

Wherein, the information bits carried in the uplink grant message may bean identifier (such as a UE ID) of the remote node, or an RNTI of theremote node, or identification information that indicates a mappingrelationship between the relay node and the remote node. Theidentification information may be the index of the mapping relationshipconfigured by the base station or predefined.

3. The relay node acquires scheduling information of the uplink relayingbehavior of the relay node, including:

the relay node acquires the scheduling information of theexplicitly-indicated uplink relaying behavior from the base station;

and/or, the relay node acquires scheduling information of the uplinkrelaying behavior which is implicitly-indicated by the base station.

Wherein, the relay node may acquire the scheduling information of a partof the explicitly-indicated uplink relaying behavior from the basestation, and the scheduling information of the remaining part of theimplicitly-indicated uplink relaying behavior.

Wherein, the relay node acquires the scheduling information of theexplicitly-indicated uplink relaying behavior from the base station,including:

the relay node monitors the UE-specific search space of the physicaldownlink control channel of the remote node according to theconfiguration information of the remote node, blindly detects thecandidate set of the physical downlink control channels by using theRNTI of the relay node, obtains the uplink grant message of the relaynode transmitted by the base station by decoding, and acquires thescheduling information for forwarding the physical uplink shared channelof the relay node from the uplink grant message; and/or,

the relay node monitors the UE-specific search space of physicaldownlink control channel of the relay node according to theconfiguration information of the relay node, blindly detects thecandidate set of the physical downlink control channels by using theRNTI of the relay node or the RNTI of both the relay node and the remotenode, obtains the uplink grant message of the relay node transmitted bythe base station by decoding, and acquires the scheduling informationfor forwarding physical uplink shared channel of the relay node from theuplink grant message.

Wherein, when the relay node performs relaying for multiple remotenodes, the relay node monitors in the UE-specific search space of thephysical downlink control channel of all the remote nodes and/or relaynodes, and performs blind detection by using RNTI of the relay nodeand/or all the remote nodes. The relay node successfully decodes morethan one uplink grant message of the remote node and more than oneuplink grant message of the relay node, and determines the mappingrelationship between the uplink grant message of remote node and theuplink grant message of relay node in accordance with the search spacefor receiving the uplink grant message and/or RNTI used for blinddetecting the uplink grant message and/or the information bits carriedin the uplink grant message and/or the time sequence or the frequencydomain resource position for receiving the uplink grant message.

Wherein, the relay node performs blind detection successfully by usingthe RNTI of the relay node in the UE-specific search space of thephysical downlink control channel of the relay node, obtains the uplinkgrant message by decoding, and determines that the uplink grant messageis that to be transmitted to the relay node according to the informationbits carried in the uplink grant message;

or, the relay node performs blind detection successfully by using theRNTI of the remote node in the UE-specific search space of the physicaldownlink control channel of the relay node, obtains the uplink grantmessage by decoding, and determines the uplink grant message is that tobe transmitted to the relay node according to the RNTI used for blinddetection and/or the information bits carried in the uplink grantmessage;

or, the relay node performs blind detection successfully by using theRNTI of the remote node corresponding to the search space in theUE-specific search space of the physical downlink control channel of theremote node, obtains the uplink grant message by decoding, anddetermines the uplink grant message is that to be transmitted to therelay node according to the UE-specific search space and/or the RNTIused for blind detection and/or the information bits carried in theuplink grant message.

Wherein, the information bits carried in the uplink grant message may bean identifier (such as a UE ID) of the relay node, or an RNTI of therelay node, or identification information that indicates a mappingrelationship between the relay node and the remote node. Theidentification information may be the index of the mapping relationshipconfigured by the base station or predefined.

Wherein, the relay node acquires scheduling information of the uplinkrelaying behavior implicitly indicated by the base station, including:

the relay node acquires the scheduling information of the physicaluplink shared channel of the remote node from the base station; therelay node determines the scheduling information of the uplink relayingbehavior of the relay node by calculation according to the schedulinginformation of the physical uplink shared channel of the remote node andthe predefined mapping relationship;

or, the relay node acquires the scheduling information of the uplinkrelaying behavior of the relay node from the base station; the relaynode determines the scheduling information of the physical uplink sharedchannel of the remote node by calculation according to the schedulinginformation of the uplink relaying behavior of the relay node and thepredefined mapping relationship.

4. The relay node receives the uplink data message transmitted by theremote node to the base station, including:

the relay node receives the physical uplink shared channel transmittedby the remote node at the scheduled resource position and successfullydecodes according to the acquired content of the physical uplink sharedchannel scheduling information of the remote node;

wherein, the scheduled resource position may be an uplink carrier or anuplink subframe, and the relay node is required to have the capabilityof receiving on an uplink carrier or an uplink subframe.

5. The relay node forwards the uplink data message of the remote node tothe base station, including:

the relay node forwards the physical uplink shared channel transmittedby the remote node to the base station on the scheduled carrieraccording to the acquired content of physical uplink shared channelscheduling information of the relaying behavior of the relay node.

The behaviors of the base station include the following operation steps:

1. The base station performs channel configuration on the remote nodeand the relay node, including:

the base station transmits the shared channel configuration informationand physical downlink control channel configuration information of theremote node to the remote node by RRC signaling, and transmits theshared channel configuration information and physical downlink controlchannel configuration information of the relay node and/or remote nodeto the relay node.

2. The base station schedules the uplink transmission of the remotenode, including:

the base station transmits an uplink grant message of the uplink dataservice of the remote node in the UE-specific search space of physicaldownlink control channel of the remote node according to the physicaldownlink control channel configuration information of the remote node,and scrambles the uplink grant message using the RNTI of the remotenode, and the uplink grant message carries the scheduling information ofthe uplink data of the remote node.

3. The base station schedules the uplink forwarding of the relay node,including:

the base station transmits the uplink grant message of the uplink dataservice, that the relay node needs to forward, in the UE-specific searchspace of the physical downlink control channel of the relay nodeaccording to the physical downlink control channel configurationinformation of the relay node, and scrambles the uplink grant messageusing the RNTI of the relay node or the remote node. The uplink grantmessage carries scheduling information of the uplink data of the relaynode;

or, the base station transmits the uplink grant message of the uplinkdata service, that the relay node needs to forward, in the UE-specificsearch space of the physical downlink control channel of the remote nodeaccording to the physical downlink control channel configurationinformation of the remote node, and scrambles the uplink grant messageusing the RNTI of the relay node. The uplink grant message carriesscheduling information of the uplink data of the relay node.

Wherein, in the uplink scheduling message of the relay node, the basestation explicitly indicates by using the information bit, or implicitlyindicates by scrambling the uplink grant message by using the RNTI, thatthe uplink transmission corresponding to the scheduling message is thetransmission of the relay node itself or an uplink transmission of aspecific remote node that needs to be forwarded. Wherein, the contentexplicitly indicated by using the information bit may be an identity(such as a UE ID) of the relay/remote node, or an RNTI, oridentification information corresponding to a mapping relationshipbetween the relay node and the remote node. The identificationinformation may be the index of the mapping relationship configured bythe base station or predefined.

Wherein, additionally, when the relay node performs relaying formultiple remote nodes, the base station sequentially transmits theuplink scheduling message of the relay node to the relay node in theUE-specific search space of the physical downlink control channel of therelay node in the order of transmitting the scheduling message to themultiple remote nodes.

4. The base station schedules transmissions between relay nodes andremote nodes, including:

the base station schedules the uplink transmission of the remote node asdescribed, and configures the relay node to monitor the schedulingmessage of the remote node; that is, the base station enables the relaynode to obtain the scheduling information of the transmission betweenthe remote node and the relay node accordingly by scheduling the remotenode without additional scheduling message transmission;

or, in addition to scheduling the uplink transmission of the remotenode, the base station additionally transmits an uplink grant message ofthe uplink data service of the remote node or a transmission grantmassage of the data service from the relay node to the remote node inthe UE-specific search space of the physical downlink control channel ofthe relay node, and scrambles the grant message by using the RNTI of therelay node or the RNTI of the remote node.

Wherein, in the scheduling message of transmission between the relaynode and the remote node, the base station explicitly indicates by usingthe information bit, or implicitly indicates by RNTI used forscrambling, that the scheduling message is used for scheduling the relaynode or a certain remote node. Wherein, the content explicitly indicatedby the information bit may be an identity (such as a UE ID) of therelay/remote node, or an RNTI, or identification informationcorresponding to a mapping relationship between the relay node and theremote node. The identification information may be the index of themapping relationship configured by the base station or predefined.

Wherein, when the relay node performs relaying for multiple remotenodes, additionally, the base station sequentially transmits thescheduling messages of the transmission between the relay node and therelay node to the relay node in the UE-specific search space of thephysical downlink control channel of the relay node or in thecorresponding frequency domain position, according to the time sequenceand or frequency domain resource position for transmitting thescheduling message to the multiple remote nodes.

Wherein, when the base station schedules the transmission between therelay node and the remote node, the scheduling message carries all theconfiguration information of the transmission, or carries part of theconfiguration information of the transmission and implicitly indicatesthe remaining part of the configuration information not carried in thescheduling message by the scheduling message of the uplink transmissionfor the remote node or the scheduling message of the uplink transmissionfor the relay node according to the predefined mapping relationship.

Wherein, the scheduling information of the transmission between therelay node and the remote node by the base station and the schedulinginformation of the transmission between the relay node and the basestation by the base station may be carried in a same DCI. When the relaynode performs relaying for multiple remote nodes, one DCI carries thescheduling information of transmission between one remote node and therelay node and the scheduling information of the relaying for the remotenode by the relay node. Or, one DCI carries scheduling information oftransmission between more than one remote nodes and the relay node andthe scheduling information of the multiple times of relaying for themore than one remote nodes by the relay node. The base station uses theinformation field in the DCI to explicitly indicate that a specificfield in the DCI is used to schedule the relay node or a specific remotenode, or not explicitly indicates that a specific field in the DCI isused for scheduling the relay node or a specific remote node in the DCI,and the relay node determines a specific field in the DCI is used forscheduling the relay node or a specific remote node according to thepredefined configuration information. In addition, when one DCI carriesscheduling information of transmission between one remote node and therelay node and the scheduling information of the relaying for the remotenode by the relay node, the base station indicates the identityinformation of the remote node by the RNTI by which the DCI isscrambled. The relay node determines that a specific field in the DCI isused for scheduling a relay node or the remote node according to thepredefined configuration information, and determines the identityinformation of the remote node by the RNTI used for scrambling.

5. The base station receives the uplink forwarding of the relay node,including:

the base station receives the physical uplink shared channel transmittedby the relay node in the scheduled resource position according to thecontent of the scheduling information of the uplink forwarding of therelay node.

In addition, the above operation steps are not in a time sequence. Theactual time sequence of each operation step needs to be determinedaccording to the scheduling content of the base station and the contentof the physical downlink control channel configuration information ofthe relay node and the remote node,

(2) For physical downlink data channel/physical downlink shared channel:

The remote node performs the reception of the physical downlink controlchannel and physical downlink shared channel according to the behaviorwhen there is no relay, including:

The remote node acquires physical downlink control channel configurationinformation and physical downlink shared channel configurationinformation from the base station by RRC signaling; the remote nodemonitors the UE-specific search space of the physical downlink controlchannel of the remote node according to the configuration information,and blindly detects the candidate set of physical downlink controlchannels by using the RNTI of the remote node, obtains the downlinkgrant message transmitted by the base station by decoding, and acquiresthe scheduling information of the physical downlink shared channel fromthe downlink grant message; the remote node receives the physicaldownlink shared channel on the scheduled resource position according tothe acquired content of the physical downlink shared channel schedulinginformation.

Further, the relay node acquires the scheduling information of thephysical downlink shared channel of the remote node from the basestation, and does not perform the receiving and relaying of the physicaldownlink shared channel.

The base station transmits the scheduling information received by thephysical downlink shared channel of the remote node to the remote node,and no longer transmits the scheduling information of the physicaldownlink shared channel of the remote node to the relay node separately.

In the following, based on the application scenario for Embodiment 1, arelaying method for uplink data information will be described withreference to a specific example, as shown in FIG. 17. The physicaluplink shared channel (PUSCH) in this example may also be EPUSCH,MPUSCH, NPUSCH. It is not limited in the embodiment of the presentdisclosure.

in this example, UE1 is a relay node with capability of relaying withinthe coverage of the cell, and UE2 and UE3 are remote nodes within thecoverage of the cell. Both UE2 and UE3 use UE1 to perform relaying ofthe physical uplink shared channel (PUSCH), and both receive thephysical downlink control channel (PDCCH) and the physical downlinkshared channel (PDSCH) directly from the base station.

UE1 normally accesses the cell and has a capability of relaying. It hasthe capability of performing downlink reception in the uplink frequencyband or uplink subframe and/or transmitting in the downlink frequencyband or the downlink subframe, and informs the base station of thecapability through high layer signaling. The UE1 acquires its own RNTI,the physical downlink control channel configuration information and theshared channel configuration information from the base station. Wherein,the UE-specific search space of the physical downlink control channel ofUE1 may be configured on the uplink carrier/uplink subframe by the basestation, or may be configured on the downlink carrier/downlink subframe.

The base station configures UE to perform relaying of uplink datatransmissions of UE2 and UE3. The UE1 acquires the configurationinformation of the UE2 and the configuration information of the UE3 fromthe base station by the RRC signaling, wherein the configurationinformation includes: the UE ID, the RNTI, the physical downlink controlchannel configuration information, and the shared channel configurationinformation.

Wherein, the physical downlink control channel configuration informationof the UE2 and/or the UE3 includes: a physical downlink control channelsearch space type, a maximum repetition number Rmax, a startingsubframe, valid subframes, a DCI format, and a physical downlink controlchannel resource configuration (such as time-frequency resourceposition: narrowband, carrier, PRB, control resource set (CORESET),wherein CORESET configuration parameters include: activation or releaseof CORESET, timing information, an ID, a frequency domain position, astart symbol, a duration, resource element group (REG), a mapping typefrom Control channel element (CCE) to REG a precoder granularity, aninterleaver column, an offset index, transmission configurationindication (TCI) state identification, demodulation reference signal(DMRS), scrambling ID).

Wherein, the shared channel configuration information of UE2 and/or UE3includes at least one of the followings: physical uplink and/or downlinkshared channel configuration information, the transmission mode ofshared channel (e.g., transmission modes 1 to 9), reference signalinformation, valid uplink and/or downlink subframes, HARQ processparameters, and a control region size with subframe.

UE2 and UE3 within the coverage of the cell have the capability ofaccessing the cell. UE2 and UE3 normally access the cell, acquires itsown RNTI from the base station, the physical downlink control channelconfiguration information and the shared channel configurationinformation.

UE2 and UE3 are configured by the base station to perform relaying ofuplink data transmission through UE1. The configuration is transparent,i.e., UE2 and UE3 do not need to know that their uplink datatransmission is completed through relaying and perform uplink datatransmission according to the original design of the non-relay system.

UE1, UE2, and UE3 perform monitoring and blind detection by using RNTIin the configured search space in the physical downlink control channelconfigured by the base station to obtain the scheduling message of theuplink transmission.

Wherein, the specific way the UE1 obtains the scheduling message of theuplink transmission includes: a method 1 (as shown in FIG. 18), a method2 (as shown in FIG. 19), and a method 3 (as shown in FIG. 20):

Method 1: UE1 monitors the UE-specific search spaces (USSs) of UE1 andUE2 and UE3, and performs blind detection by using the RNTIcorresponding to the search space;

For example, in this method, the base station transmits the uplink grantmessages #1 and #3 in the UE-specific search space of the UE1, andscrambles the uplink grant message by using the RNTI of the UE1 tosequentially indicate the scheduling information that the UE1 performsuplink forwarding for the UE2 and the scheduling information that UE1performs the uplink forwarding for UE3; the base station transmits anuplink grant message #2 in the UE-specific search space of UE2, andscrambles the uplink grant message by using RNTI of UE2 to indicatescheduling information of uplink data transmission of UE2; the basestation transmits uplink grant message #4 in a UE-specific search spaceof UE3, and scrambles by using RNTI of UE3 to indicate schedulinginformation of uplink data transmission of UE3.

UE1 performs blind detection successfully by using the RNTI of UE2 inthe UE-specific search space of UE2, obtains the uplink grant message(UL grant) #2 by decoding, considers the uplink grant message asscheduling information used to indicate the uplink data transmission ofUE2, and receives physical uplink shared channel (PUSCH) transmission ofthe UE2 according to the content of the grant message #2;

UE1 performs blind detection successfully by using the RNTI of UE3 inthe UE-specific search space of UE3, obtains the uplink grant message #4by decoding, considers the uplink grant message as schedulinginformation used to indicate the uplink data transmission of UE3, andreceives PUSCH transmission of the UE3 according to the content of theuplink grant message #4;

When UE1 performs blind detection successfully twice by using the RNTIof UE1 in the HE-specific search space of UE1, obtains two uplink grantmessages #1 and #3 by decoding, considers the uplink grant messages asscheduling information used to indicate the uplink relaying of UE1.According to the fact that the time sequence of receiving the uplinkgrant messages of UE2 and UE3 is UE2 is earlier than UE3, it isconsidered that uplink grant message #1 as scheduling information usedto indicate UE1 to forward the uplink data of UE2 (corresponding touplink grant message #2), and the uplink grant message #3 is consideredas the scheduling information used to indicate the UE1 to forward theuplink data of the UE3 (corresponding to the uplink grant message #4).According to the content of the uplink grant message, the successfullydecoded uplink data of UE2 and UE3 are forwarded.

In this method, it is additionally possible that the base stationtransmits another two uplink grant messages (e.g., #5 and #6) in theHE-specific search space of UE2 and UE3, and scrambles the uplink grantmessage by using the RNTI of UE1, to sequentially indicate thescheduling information that UE1 performs uplink forwarding for the UE2and the scheduling information that UE1 performs uplink forwarding forUE3, but the two messages are not decoded when UE2 and UE3 perform blinddetection with their own RNTIs. When the UE1 performs blind detectionsuccessfully by using the RNTI of UE1 in the UE-specific search space ofthe UE2 and obtains the uplink grant message by decoding, the uplinkgrant message is considered as the scheduling information used toindicate the UE1 to forward the physical uplink shared channel of theUE2, Similarly, the UE1 performs blind detection successfully by usingthe RNTI of the UE1 in the UE-specific search space of the UE3, obtainsthe uplink grant message by decoding, the uplink grant message isconsidered as the scheduling information used to indicate UEI to forwardthe physical uplink shared channel of UE3.

Method 2: UE1 monitors the UE-specific search space of UEI, and performsblind detection by using RNTIs of UE1, UE2 and UE3 in the UE-specificsearch space of UE1;

For example, in this method, the base station transmits an uplink grantmessage #1 (scrambled by RNTI of UE1), an uplink grant message #2A(scrambled by RNTI of UE2), and an uplink grant message #3 (scrambled byRNTI of UE1) and an uplink grant message #4A (scrambled by RNTI of UE3)in the UE-specific search space of UE1, to sequentially indicate thescheduling information that the UE1 performs uplink forwarding for theUE2, the scheduling information of uplink data transmission of UE2, thescheduling information that UE1 performs uplink forwarding for UE3, andthe scheduling information of uplink data transmission of UE3; the basestation transmits an uplink grant message #2 in the UE-specific searchspace of the UE2, and scrambles it by using the RNTI of the UE2 toindicate the scheduling information of the uplink data transmission ofthe UE2; the base station transmits an uplink grant message #4 in theUE-specific search space of UE3, and scrambles the uplink grant message#4 by using the RNTI of the UE3 to indicate the scheduling informationof the uplink data transmission of the UE3.

UE1 perform the blind detection successfully by using the RNTI of theUE2 in the UE-specific search space of the UE1, obtains the uplink grantmessage #2A by decoding, considers the uplink grant message asscheduling information used to indicate the uplink data transmission ofUE2, and receives PUSCH transmission of the UE2 and decodes successfullyaccording to the content of the uplink grant message #2A;

UE1 performs blind detection successfully using the RNTI of UE3 in theUE-specific search space of UE1, obtains the uplink grant message #4A bydecoding, considers the uplink grant message as scheduling informationused to indicate the uplink data transmission of UE3, and receives PUSCHtransmission of UE3 and decodes successfully according to the content ofthe grant message #4A;

UE1 performs blind detection successfully twice by using the RNTI of UE1in the UE-specific search space of UE1, obtains two uplink grantmessages #1 and #3 by decoding, considers the uplink grant messages asscheduling information used to indicate the uplink relaying of UE1.According to the time sequence of receiving the uplink grant messages ofUE2 and UE3 as UE2 is earlier than UE3, it is considered that uplinkgrant message #1 is used to indicate the scheduling information that UE1forwards the uplink data of UE2 (corresponding to uplink grant message#2A), and the uplink grant message #3 is used to indicate the schedulinginformation the UE1 forwards the uplink data of the UE3 (correspondingto the uplink grant message #4A). According to the content of the uplinkgrant message, the successfully decoded uplink data of UE2 and UE3 areforwarded.

In this method, it is additionally possible that the uplink grantmessage contains an information bit explicitly indicating the target UEof the uplink grant message, and the information bit may be an identity(such as a UE ID) of UE, or an RNTI, or an index indicating the mappingrelationship between the relay node and the remote node.

For example, when the base station configures UE1 to perform uplinkrelay for UE2/3, the index for the mapping relationship of UE1-LTE2 isconfigured as 1, the index for the mapping relationship of UE1-UE3 isconfigured as 2, and the index for the mapping relationship of UE1itself is configured as 0.

UE1 performs blind detection successfully by using the RNTI of UE3 inthe UE-specific search space of UE1, obtains the uplink grant message#4A by decoding, and considers the uplink grant message #4A as thescheduling information used to indicate the PUSCH of UE3 according tothe information bit explicitly indicating the target UE of the uplinkgrant message being the index of the mapping relationship which isconfigured to have an index value 2; or considers the uplink grantmessage #4A as the scheduling information used to indicate UE1 toforward the uplink data of UE3 to the base station according to theinformation bit explicitly, indicating the target UE of the uplink grantmessage being the index for the mapping relationship which is configuredto have an index value 0.

For example, when the base station configures UE1 to perform uplinkrelaying for UE2 and/or UE3, in the mapping relationship configurationfor UE1 and all remote UEs, the index of the relay node (i.e., UE1itself) is 0, and indexes of all the remote UEs (i.e., UE2 and/or ofUE3) are 1.

UE1 performs blind detection successfully by using the RNTI of UE3 inthe UE-specific search space of UE1, obtains the uplink grant message#4A by decoding, and considers the uplink grant message #4A as thescheduling information used to indicate the PUSCH of UE3 according tothe information bit explicitly indicating the target UE of the uplinkgrant message #4A being the index of the mapping relationship which isconfigured to have an index value 1; or considers the uplink grantmessage #4A as the scheduling information used to indicate UE1 toforward the uplink data of UE3 to the base station according to theinformation bit explicitly indicating the target UE of the uplink grantmessage #4A being the index of the mapping relationship which isconfigured to have an index value 0.

For example, UE1 performs blind detection successfully by using the RNTIof UE1 in the UE-specific search space of UE1, and considers the uplinkgrant message as the scheduling information used to indicate UE1 toforward the uplink. data of UE3 according to the information hitexplicitly indicating the target UE in the uplink grant message beingthe RNTI of UE3.

Method 3: The UE1 monitors the UE-specific search space of the UE1,performs blind detection by using the RNTI of the UE1 in the UE-specificsearch space of the UE1, and obtains an information bit indicatingexplicitly the target UE in the uplink grant message.

For example, in this method, the base station transmits uplink grantmessages #1, #2A, #3, and #4A in the UE-specific search space of UE1,and scrambles all of them by using the RNTI of the UE1 to sequentiallyindicate the scheduling information that the UE1 performs uplinkforwarding for the UE2, the scheduling information of the uplink datatransmission of the UE2, the scheduling information that UE1 performsthe uplink forwarding for UE3, and the scheduling information of theuplink data transmission of the UE3; wherein, the base station transmitsan uplink grant message #2 in the UE-specific search space of UE2, andscrambles it by using RNTI of UE2 to indicate scheduling information ofuplink data transmission of UE2; the base station transmits uplink grantmessage #4 in the UE-specific search space of UE3, and scrambles it byusing RNTI of UE3 to indicate scheduling information of uplink datatransmission of UE3.

UE1 performs blind detection successfully by using the RNTI of UE1 inthe UE-specific search space of UE1, obtains four uplink grant messages#1, #2A, #3, #4A by decoding it, and determines the four uplink grantmessages sequentially used to schedule UE1, UE2, UE1 and UE3. It isdetermined that the four uplink grant messages are used to indicate thescheduling information that UE1 forwards the uplink data of UE2, thescheduling information of the uplink data of UE2, the schedulinginformation that UE1 forwards the uplink data of UE3, and schedulinginformation of uplink data of UE3, according to the reception timesequence.

Additionally, for UE1 to obtain the scheduling message of the uplinktransmission, a combination of the three methods is used. For example,UE1 monitors the UE-specific search space of UE1 and performs blinddetection by using RNTIs respectively corresponding to UE1, UE2 and UE3,and UE1 monitors the UE-specific search space of UE2 and performs blinddetection by using RNTI of UE2. UE1 performs blind detectionsuccessfully by using the RNTI of the UE2 in the UE-specific searchspace of the UE2. In the obtained uplink grant message by decoding, theinformation bit explicitly indicating the target UE is the index of themapping relationship which is configured to have an index value 0. UE1considers the uplink grant message is the scheduling information used toindicate UE1 to forwards the uplink data of the remote UE to the basestation according to the mapping index value and considers the forwardedremote UE as the UE2 according to the search space; UE1 performs blinddetection successfully by using the RNTI of the UE2 in the UE-specificsearch space of the UE1, and obtains the uplink grant message bydecoding. UE1 considers the uplink grant message is the schedulinginformation used to indicate UE1 to forward the uplink data of theremote UE to the base station according to the search space, andconsiders the forwarded remote UE as the UE2 according to RNTI.

By the above method, UE1 relays uplink data for UE2, and obtains twouplink grant messages transmitted by the base station by search spacemonitoring and blind detection using of RNTI (for example, uplink grantmessages #2A and #1 or #2 and #1 in FIG. 21) respectively to indicateuplink scheduling information of UE2 and uplink transmission schedulinginformation of UE1 forwarding the data of UE2;

or, UE1 obtains an uplink grant message (for example, uplink grantmessage #2 in FIG. 22) transmitted by the base station to indicateuplink scheduling information of UE2, and UE1 derives the uplinktransmission scheduling information of the UE1 forwarding the data ofUE2 according to the predefined mapping relationship and according tothe uplink transmission scheduling information of UE2. For example, thetime domain of the resource position of UE1 forwarding starts at thefirst valid subframe calculated from the fourth subframe after the UE2uplink transmission ends, and the frequency domain position uses thecarrier and repetition number pre-configured by the base station; or,similarly, UE1 obtains an uplink grant message transmitted by the basestation that indicates the scheduling information of uplink transmissionfor UE1 to forward the data of UE2, and UE1 derives the uplinktransmission scheduling information for UE2 according to the predefinedmapping relationship and the scheduling information of the forwarding;

or, UE1 obtains one uplink grant message transmitted by the basestation, indicates the uplink transmission scheduling information ofUE2, and also indicates the uplink transmission scheduling informationthat UE1 forwards the data of UE2. The first N1 bits in the uplink grantmessage are used to indicate uplink transmission scheduling informationof UE2, including indicating the UE ID of the UE2 or indicating the RNTIof the UE2 or indicating an index of the mapping relationship betweenthe UE1 and the UE2, and the last N2 bits are used to indicate theuplink transmission scheduling information that the UE1 forwards thedata of the UE2;

or, the UE1 obtains two uplink grant messages transmitted by the basestation, wherein one or two message contains incomplete schedulinginformation, and the scheduling information of the part not provided bythe base station is derived and calculated according to the obtainedscheduling information and predefined configuration parameters, forexample, UE1 obtains the uplink grant message #2, transmitted by thebase station, for scheduling the uplink transmission of the UE2 whichincludes the resource position of uplink transmission of UE2, andobtains the uplink grant message #1, transmitted by the base station,for scheduling the UE1 to relay the UE2, which includes the resourceposition of the uplink transmission of the UE1 and the number ofrepetitions; UE1 determines the number of repetitions of UE2 uplinktransmission according to a predefined relay link configurationparameter.

UE2 and UE3 act as remote UEs, and maintain the behavior when there isno relay, that is, UE2/UE3 monitors its own TIE-specific search spaceand uses its own RNTI to perform blind detection. When the blinddetection is successfully and the uplink grant message is obtained bydecoding, and data transmission is performed on the physical uplinkshared channel according to the scheduled content of the message.

UE2 and UE3 obtains scheduling information transmitted by using theirown uplink data, and perform uplink data transmission according to thecontent of the scheduling information.

UE1 acquires the uplink scheduling information of the UE2 and the UE3,and receives the uplink transmission of the UE2/UE3 according to thecontent of the uplink scheduling information, and successfully decodes.Wherein, the uplink transmission resource position of the UE2 and theUE3 is in an uplink subframe or an uplink frequency band, and UE1performs downlink reception in an uplink subframe or an uplink frequencyband.

UE1 obtains the scheduling information of the uplink forwarding of theUE1, which includes the scheduling information for forwarding for UE2and scheduling information for forwarding for UE3. The UE1 forwards theuplink data of the UE2 and the UE3 that are successfully received anddecoded according to the content of the scheduling information.

In this scenario, for downlink data transmission, UE2 and UE3 act asremote UEs, and maintain the behavior when there is no relay, that is,UE2 and/or UE3 monitors its own UE-specific search space and use its ownRNTI to perform blind detection. When the blind detection issuccessfully and the downlink grant message is obtained by decoding, thedata transmission of the base station is received according to thescheduled content of the message.

The UE1 acts as a relay UE and does not perform other operations afterthe blind detection is successfully and the downlink grant message ofUE2 and/or UE3 is obtained by decoding.

The base station maintains the behavior when there is no relay, that is,the base station schedules reception of the downlink data of UE2 and/orUE3, and does not additionally transmit information related to thedownlink scheduling to UE1.

Embodiment 2

This embodiment describes the operation behaviors executed by the remotenode, the relay node, and the base station in the scenario in which therelay node performs relaying of uplink data and relaying of downlinkdata, and does not perform relaying on the DCI.

(1) For the physical uplink data channel and/or the physical uplinkshared channel:

The specific operation behaviors executed by the remote node and therelay node are the same as that in Embodiment 1, and details will not berepeated herein.

(2) For physical downlink data/downlink shared channel:

The operation behaviors of the remote node include:

similar to the uplink relay, the remote node acquires schedulinginformation of the downlink reception from base station according to thebehavior when there is no relay, and receives the downlink data messagetransmitted by the base station according to the content of the downlinkscheduling information.

The operation behaviors of the relay node include:

1. the relay node acquires the configuration information of the relaynode and the configuration information of the remote node from the basestation, and the specific content is the same as that in Embodiment 1,and details will not be repeated herein.

2. the relay node acquires the scheduling information of the downlinkreception of the remote node from the base station, and the specificmethod is the same as that in Embodiment 1, but the downlink grantmessage of the remote node transmitted by the base station is obtainedby decoding.

3. the relay node acquires the scheduling information of the downlinkrelaying behavior of the relay node, and the specific method is the sameas that in Embodiment 1, but the downlink grant message of the relaynode transmitted by the base station is obtained by decoding.

Wherein, similarly, the information field carried in the downlink grantmessage is used to explicitly indicate the node scheduled by thedownlink grant message, and may be the identity of the remote node (suchas UE ID), or the RNTI of the remote node, or the index indicating themapping relationship between the relay node and remote node, and ascheduling object for determining the downlink grant message.

4. The relay node receives the downlink data message transmitted by thebase station to the relay node, including:

the relay node receives the physical downlink shared channel transmittedby the base station at the scheduled resource position according to thecontent of the obtained physical downlink shared channel schedulinginformation of the relay node, and successfully decodes it.

5. The relay node forwards the downlink data message transmitted by thebase station to the remote node, including:

the relay node receives the content of the scheduling information of thephysical downlink control channel according to the acquired remote node,and forwards the physical downlink shared channel transmitted by thebase station to the remote node on the scheduled.

Wherein, the scheduled resource position may be a downlink carrier or adownlink subframe, and it is necessary for the relay node to have thecapability of receiving on the downlink carrier or downlink subframe.

The behaviors of the base station include:

1. The base station configures the remote node and the relay node, thespecific content is the same as that in Embodiment 1, and details willnot be repeated herein.

2. The base station schedules the downlink reception of the remote node(that is, the downlink data forwarding of the relay node), and thespecific method is the same as that in Embodiment 1, but the basestation transmits the downlink grant message of the remote node.

3. The base station schedules the downlink reception of the relay node,and the specific method is the same as that in Embodiment 1, but thebase station transmits the downlink grant message of the relay node.

Wherein, similarly, the information field carried in the downlink grantmessage is used to explicitly indicate the node scheduled by thedownlink grant message, and may be the identity of the remote node (suchas UE ID), or the RNTI of the remote node, or the index indicating themapping relationship between the relay node and remote node, and ascheduling object for determining the downlink grant message.

4. The base station schedules the transmission between the relay nodeand the remote node. The specific method is the same as that inEmbodiment 1, but the base station transmits the downlink grant messageof the relay node and/or the remote node.

5. The base station transmits the downlink data message to the relaynode, including:

The base station transmits the physical downlink shared channel to therelay node in the scheduled resource position according to the contentof the scheduling information for the downlink reception of the relaynode.

It is to be noted that, the above operation behavior steps are not in atime sequence. The actual time sequence of each operation behavior stepneeds to be determined according to the scheduling content of the basestation and the content of the physical downlink control channelconfiguration information of the relay node and the remote node.

In the scenario of Embodiment 2, the relay node is configured to performuplink data forwarding and downlink data forwarding, wherein the methodfor forwarding the uplink data the is the same as that in Embodiment 1.The method for forwarding the downlink data is similar to the method forforwarding the uplink data, but the used scheduling information hereinis the downlink scheduling information which is acquired by decoding toobtain a downlink grant message in the physical downlink controlchannel.

The specific behavior of downlink data relaying is described below withreference to specific examples. The PDSCH in this example may also beEPDSCH, MPDSCH, or NPDSCH.

In this example, as shown in FIG. 23, UE1 is a relay node with thecapability of relaying within the coverage of the cell, and UE2 and UE3are remote nodes within the coverage of the cell. Both UE2 and UE3 useUE1 to perform relaying of the PDSCH, and both receive the PDCCHdirectly from the base station.

Similar to Embodiment 1, UE1 normally accesses the cell, acquires itsown RNTI and various configuration information from the base station,and is configured by the base station to perform relaying of downlinkdata reception of UE2 and UE3, and acquires the configurationinformation of UE2 and UE3 from the base station through RRC signaling,the content of which is the same as that in Embodiment 1.

UE2 and UE3 have the capability of accessing the cell within thecoverage of the cell. UE2 and UE3 access the cell normally, and acquirethe RNTI and various configuration information from the base station.UE2 and UE3 are configured by the base station to perform relaying ofdownlink data reception through UE1. The configuration is transparent,that is, UE2 and UE3 do not need to know that downlink data reception iscompleted through relaying, and perform the downlink data receptionaccording to the original design of the non-relay system.

UE1, UE2, and UE3 perform monitoring and blind detection by using RNTIin the configured search space in the physical downlink control channelconfigured by the base station to obtain a scheduling message ofdownlink reception.

The specific ways that the base station transmits the downlinkscheduling message and UE1, UE and UE3 obtain the scheduling message ofthe downlink reception are the same as that Embodiment 1, but thescheduling message of the downlink reception of the physical downlinkshared channel of UE 1/2/3 is carried in the downlink grant message.

UE1 obtains the scheduling information that the UE1 performs thedownlink reception from the base station, which includes the schedulinginformation of the downlink data that needs to be forwarded to the UE2and the scheduling information of the downlink data that needs to beforwarded to the UE3. UE1 receives the downlink data that needs to beforwarded to the UE2/UE3 transmitted by the base station according tothe content of the scheduling information.

UE1 obtains the scheduling information of the downlink reception of theUE2 and UE3, and the UE1 forwards the downlink data that needs to beforwarded to the UE2/UE3 transmitted by the base station to the UE2/UE3on corresponding resource position according to the content of thescheduling information. Wherein, the resource positions of downlinkreception of UE2 and UE3 are in a downlink subframe or a downlinkfrequency band, and UE1 transmits in the downlink subframe or thedownlink frequency band. UE2 and UE3 obtain scheduling information oftheir own downlink data reception, and receive downlink data accordingto the content of the scheduling information.

Embodiment 3

In Embodiment 3, the operation behaviors corresponding to the remotenode, the relay node, and the base station in the scenario in which therelay node performs relaying of uplink data, downlink data, and DCI aredescribed.

From the perspective of the system, the difference between Embodiment 3and Embodiment 1 and Embodiment 2 is that the relay node additionallyrelays forwards the DCI transmitted by the base station to the remotenode, and the remote node acquires from the relay node instead of thebase station the uplink scheduling information and the downlinkscheduling information, the base station does not directly transmit theDCI to the remote node, but transmit the DCI to the relay node.

From the perspective of the remote node, all the relaying operations inEmbodiment 3 are transparent, that is, the remote node does not need toknow that the transmission (reception) of its uplink/downlink data andDCIs is completed through relaying, and performs the transmission(reception) of uplink data and downlink data and DCIs according to theoriginal design of the non-relay system. Therefore, the behavior of theremote node is the same as that in Embodiment 1 and/or Embodiment 2. Itwill not be repeated herein

From the perspective of the relay node:

(1) For the physical uplink and downlink data channels/shared channels:

the method of the relay node acquiring the scheduling information of theuplink data transmission and the downlink data reception of the remotenode and the relay node from the base station in Embodiment 1 andEmbodiment 2 can still be used in Embodiment 3. After acquiring thescheduling information of the remote node and the relay node, the methodfor the relay node to perform uplink/downlink transmission(forwarding)/reception according to the content of the schedulinginformation is the same as that in Embodiment 1/2. It will not berepeated herein.

(2) For the physical downlink control channel:

The relay node receives the DCI of the remote node and decodes it, andforwards the successfully decoded DCI to the remote node.

Wherein, the behavior of the relay node includes:

1. The relay node acquires configuration information of the relay nodeand the remote node from the base station, as described in Embodiment 1and Embodiment 2. It will not be repeated herein.

2. The relay node receives the DCI of the remote node, and reuses themethod of the relay node acquiring the scheduling information of theremote node from the base station in Embodiment 1 and Embodiment 2, butall the type of control message successfully decoded of the remote nodein Embodiment 3 are included in the control information of the remotenode, and are not limited to the uplink grant message and/or thedownlink grant message of the remote node. For example, the relay nodereceives and successfully decodes a Transmitter Power Control (TPC)command transmitted by the base station to the remote node, and forwardsthe TPC command to the remote node in the next step.

3. The relay node forwards the successfully received DCI of the remotenode to the remote node, including:

The relay node receives the DCI of the remote node and decodes itsuccessfully; the relay node determines the position of the earliestUE-specific search space of physical downlink control channel of theremote node after the decoding succeeds according to the configurationinformation of the remote node; the relay node forwards the DCI to theremote node in the UE-specific search space of physical downlink controlchannel.

From the perspective of the base station:

(1) For the physical uplink and downlink data/shared channels:

The method of base station performing uplink data reception and downlinkdata transmission to the remote node and/or the relay node in Embodiment1 and Embodiment 2 is still applicable to Embodiment 3.

(2) For the physical downlink control channel:

The method of base station transmitting the scheduling information of acommunication between the relay node and the base station and thescheduling information between the relay node and the remote node to therelay node in Embodiment 1 and Embodiment 2 is still applicable toEmbodiment 3. The method can be similarly applicable to transmitting ofthe other DCI to the remote node by the base station, and further thestep of the base station transmitting the DCI of the remote node to therelay node. The base station will not transmit the DCI to the remotenode additionally, except for the relay node.

Further, the base station determines the position of the earliestUE-specific search space of physical downlink control channel of theremote node after the relay node decodes the DCI of the remote node thatneeds to be forwarded, according to the physical shared channel and thephysical control channel configuration information of the relay node andthe remote node, determines the content of the base station performingresource scheduling for the remote node and/or the relay node in thecontrol message according to the position, and adjusts the timing of thetransmitting behavior and/or the timing of the receiving behavior of thebase station accordingly.

The relaying method of the DCI is described below based on the scenarioof Embodiment 3. The PDCCH in this example may also be an EPDCCH, anMPDCCH, or an NPDCCH.

In this example, as shown in FIG. 24, UEI is a relaying node with thecapability of relaying within the coverage of the cell, and UE2 and UE3are remote nodes within the coverage of the cell. Both UE2 and UE3 useUE1 to perform forwarding of the PUSCH, the PDCCH, and the PDSCH.

Similar to Embodiment 1 and Embodiment 2, UE1 accesses the cellnormally, acquires its own RNTI and various configuration informationfrom the base station, and is configured by the base station to performrelaying of physical downlink control channel of UE2 and UE3, andacquires the configuration information of the UE2 and UE3 from the basestation through RRC signaling, the content of which is the same as thatin Embodiment 1 and Embodiment 2. It will not be repeated herein.

UE2 and UE3 have the capability of accessing the cell within thecoverage of the cell. UE2 and UE3 access the cell normally, and acquireits own RNTIs and various configuration information from the basestation. UE2 and UE3 are configured by the base station to performrelaying of physical downlink control channel through UE1. Theconfiguration is transparent, that is, UE2 and UE3 do not need to knowthat physical downlink control channel reception is completed throughrelaying, and perform the DCI reception according to the original designof the non-relay system.

The specific way the UE1 obtains the DCI is the same as the way the UEobtains the scheduling message of downlink reception in Embodiment 1 andEmbodiment 2. As shown in FIG. 19 or FIG. 20, UE1 obtains, by decoding,the DCI #1 and the DCI #3 of UE1, the DCI #2 of UE2, and the DCI #4 ofUE3. It should be noted that the methods in Embodiments 1 and 2 alsosupport that UE1 obtains the DCI of UE2 in the UE-specific search spaceof UE2 by decoding, and the DCI transmitted by the base station may bedecoded by UE2 through blind detecting the UE-specific search space, andmay not be directly decoded by UE2 due to link quality, etc., and bothdoes not affect the process in which UE1 relays the DCIs.

UE1 relays the DCI #2 and the DCI #4. UE1 determines the position of theearliest UE-specific search space of physical downlink control channelof UE2 and/or the position of the earliest UE-specific search space ofphysical downlink control channel of UE3 according to the controlchannel configuration message of the UE2 and/or the control channelconfiguration message of the UE3. The position may be in the same periodor in a different period as the UE-specific search space of physicaldownlink control channel of UE1, as shown in FIG. 25 and FIG. 26. UE1determines the candidate position and physical layer parameters of theDCI in the position of the UE-specific control space of the physicaldownlink control channel of the UE2 and/or the UE3 according to thecontrol channel configuration message of the UE2 and/or the controlchannel configuration message of the UE3; accordingly, the DCIs of UE2and/or UE3 are relayed at candidate positions in the UE-specific searchspace of UE2 and/or UE3, as shown in FIG. 27. When the base stationschedules the resource position of the data transmission/reception forUE1 and UE2/3, the base station determines the positions of UE-specificsearch space of the UE1 and UE2 and/or UE3 according to the physicaldownlink control channel configuration information of UE1 and UE2 and/orUE3, and calculates the position of the earliest UE-specific searchspace of UE2 and/or UE3, after decoding the DCI that needs to beforwarded by UE1, and determining the earliest start position of theresource scheduling according to the position. For example, when UE1forwards the grant message of the uplink data or downlink data for UE2and/or UE3, the resource position scheduled by the base station for theuplink/downlink data transmission is not earlier than the n subframesafter the end position of the earliest UE-specific search space of UE2and/or UE3 after UE1 completes decoding, as shown in the FIG. 28.

UE2 and UE3 act as remote UEs, and maintain the behavior when there isno relay, that is, UE2 and/or UE3 monitor its own UE-specific searchspace and perform blind detection by using its own RNTI, and obtain theDCI by decoding when the blind detection is successfully.

Embodiment 4

Embodiment 1, Embodiment 2, and Embodiment 3, the relay node does notchange the message content or information bits of the forwarded uplinkdata and/or the downlink data and the DCI, and changes or does notchange transmission parameters, such as the repetition number,modulation and coding scheme (MCS). For example, when the transmissionparameters configured by the base station for the remote node and theforwarding transmission parameters configured for the relay node aredifferent, the forwarding is performed according to the transmissionparameters configured by the base station.

Further, the relay node changes the forwarded message content orinformation bits during forwarding.

For example, when the relay node forwards the DCI for the remote node,the number of repetitions and the MCS in the DCI transmitted by the basestation to the remote node are changed according to the link qualityfrom the relay node to the remote node.

For another example, in a scenario where the relay node forwards the DCIof the data transmission for the remote node, the resource positionwhere the remote node performs the uplink and downlink data transmission(reception) is indicated in the form of the time domain offset (whichmay be the number of subframes) between the data transmission resourceand the control message transmission resource in the DCI for scheduling.In the uplink grant message and/or the downlink grant message that needsto be forwarded transmitted by the base station to the relay node, theindicated offset is the offset between the uplink grant message and/ordownlink grant message and the data resources of the remote node; whenthe relay node forwards the uplink and/or downlink grant message to theremote node, the relay node changes the value of the offset indicated inthe control message forwarded by the relay node according to the timedomain position of the actual transmission resource of control messageof the relay node and the data resource position of remote nodecalculated by the relay node. FIG. 29 is an example of uplink dataforwarding, in the uplink grant message #2A transmitted by the basestation to the relay node for indicating the data resource position ofthe remote node, the indicated offset is t1; in the uplink grant message#2 forwarded by the relay node to the remote node, the message field ismodified, and the indicated offset is t2.

In addition, Embodiment 1, Embodiment 2, and Embodiment 3 describe atransparent relaying method, in which the remote node does not knowwhether the transmission and/or reception of the shared and/or controlchannel is completed through the relay node. Additionally, the systemmay also use a non-transparent relaying method, that is, the remote nodeknows that the transmission and/or reception of its shared and/orcontrol channel is completed through relaying. Further, the remote nodedoes not know the identity of the relay node, or know that the relaynode is a specific UE.

For the case of non-transparent transmission, the remote node acquiresconfiguration information of the remote node itself from the relay nodethrough RRC signaling; further, the remote node acquires configurationinformation of the relay node from the base station through RRCsignaling. Wherein the configuration information of the remote nodeand/or the configuration information of the relay node include: a UE ID,an RNTI, physical downlink control channel configuration information,and shared channel configuration information.

Through this design, the remote node outside the coverage of the cellhas the capability of acquiring its own configuration information,thereby enabling communication with the base station through theforwarding of the relay node, so that the scenario range supported bythe design includes the remote nodes within the coverage of cell and theremote nodes outside the coverage of cell.

Further, the remote node has obtained configuration information of therelay node from the base station through RRC signaling, and the remotenode uses the RNTI of the relay node in its own UE-specific search spaceto perform blind detection, and the blind detection succeeds and obtainsthe DCI by decoding, and determines an indication object of the DCIaccording to a search space used by the DCI and/or a RNTI for blinddetection and/or a carried target-UE information bit, and otheroperations is performed according to content in the DCI. For example, aremote node obtains its own uplink data scheduling information anduplink forwarding scheduling information of the relay node, and performsuplink transmission in a cooperative manner with the relay node in theforwarding resource position of the relay node, thereby enhancingtransmission power.

The embodiment of the present disclosure provides a first UE, as shownin FIG. 30, including: a first receiving module 3001, a forwardingmodule 3002, wherein:

the first receiving module 3001 is configured to receive configurationinformation transmitted by the base station.

Wherein, the configuration information is used to receive information ofthe second UE.

The first receiving module 3001 is further configured to receive theinformation of the second UE according to the configuration information.

The forwarding module 3002 is configured to forward the information ofthe second UE received by the first receiving module 3001.

Wherein, the configuration information includes at least one of thefollowings: an identity of the second UE, RNTI information of the secondUE, physical downlink control channel configuration information of thesecond UE, physical downlink control channel configuration informationof the first LTE, shared channel configuration information of the firstUE, and shared channel configuration information of the second UE;

wherein, the physical downlink control channel configuration informationincludes at least one of the followings: a physical downlink controlchannel search space type, a maximum repetition number Rmax, a startingsubframe, an offset, valid subframes, a DCI format, and a physicaldownlink control channel resource configuration information;

the shared channel configuration information includes at least one ofthe followings: configuration information of the physical uplink sharedchannel, configuration information of the physical downlink sharedchannel, transmission mode of the shared channel, reference signalinformation, uplink valid subframes, downlink valid subframes, and HARQprocess parameters and a control region size within subframe.

Specifically, the first receiving module 3001 is configured to acquirephysical downlink control channel configuration information of thesecond UE and/or physical downlink control channel configurationinformation of the first UE according to the configuration information;monitors the physical downlink control channel of the second UE and/orphysical downlink control channel of the first UE according to theacquired physical downlink control channel configuration information ofthe second UE and/or physical downlink control channel configurationinformation of the first UE; and obtain the first scheduling informationby decoding, wherein the first scheduling information is used forindicating the reception of the shared channel of the second UE.

The first receiving module 3001 is further configured to receive datainformation of the second UE according to the first schedulinginformation.

Specifically, the first receiving module 3001 is specifically furtherconfigured to receive uplink data information of the second UE on thephysical uplink shared channel of the second UE according to the firstscheduling information.

The first receiving module 3001 is specifically further configured toreceive downlink data information of the second UE on the physicaldownlink shared channel of the second UE or the physical downlink sharedchannel of the first UE according to the first scheduling information.

Wherein, the uplink data information of the second UE is transmitted bythe second UE according to the control information directly received bythe base station, or the uplink data information of the second UE istransmitted by the second UE according to the control informationforwarded by the first UE.

Specifically, the forwarding module 3002 is specifically configured toreceive second scheduling information transmitted by the base station.

Wherein, the second scheduling information is used for the first UE toforward data information of the second UE.

The forwarding module 3002 is further specifically configured to forwardthe received data information of the second UE according to the secondscheduling information.

Wherein, the data information of the second LIE is received at thesecond UE according to the control information directly received fromthe base station, or the data information of the second UE is receivedat the second UE according to the control information forwarded by thefirst UE.

Specifically, the first receiving module 3001 is further configured tomonitor the physical downlink control channel of the second UE and/orthe physical downlink control channel of the first UE, and obtain thesecond scheduling information by decoding.

Specifically, the forwarding module 3002 is further specificallyconfigured to add a Medium Access Control (MAC) header or a radio linkcontrol (RLC) header before received data information of the second UE.

The forwarding module 3002 is further specifically configured to forwarddata information of the second UE after adding the header.

Specifically, the first receiving module 3001 is further specificallyconfigured to acquire physical downlink control channel configurationinformation of the second UE and/or physical downlink control channelconfiguration information of the first UE according to the configurationinformation.

The first receiving module 3001 is further specifically configured to:monitor the physical downlink control channel of the first UE and/or thephysical downlink control channel of the second UE according to theacquired physical downlink control channel configuration information ofthe second UE and/or physical downlink control channel configurationinformation of the first UE, and obtain the DCI of the second UE bydecoding.

The forwarding module 3002 is further specifically configured to forwardthe DCI of the second UE to the second UE on the physical downlinkcontrol channel of the second UE.

Further, the device further includes: a determining module 3003 (notshown).

The determining module 3003 is configured to determine whether thecontrol information which is obtained by decoding according to theconfiguration information is used to schedule the first UE and/or thesecond UE, according to at least one piece of the following information:the information bits carried in the control message, scrambled RNTI ofthe control information, and a search space for decoding the controlinformation.

Wherein, the content carried in the information bit includes at leastone of the followings: an identity of the first UE, an identity of thesecond UE, an RNTI of the first UE, an RNTI of the second UE, andidentification information of the mapping relationship between a firstUE and the second UE.

The embodiment of the present disclosure provides a first UE. Comparedwith the prior art, the first UE in the embodiment of the presentdisclosure receives configuration information transmitted by a basestation, wherein the configuration information is used to receiveinformation of the second UE, and receives the information of the secondUE according to the configuration information, then forwards thereceived information of the second UE, so that the base station and theremote node (the second UE) can perform relay transmission through therelay node (the first UE).

An embodiment of the present disclosure provides a base station, asshown in FIG. 31, including: a transmitting module 3101, and a secondreceiving module 3102, wherein:

the transmitting module 3101 is configured to transmit configurationinformation to the first UE.

The transmitting module 3101 is further configured to transmitinformation of the second UE to the second UE through the first UEaccording to the configuration information.

The second receiving module 3102 is configured to receive information ofthe second UE forwarded by the first UE according to the configurationinformation.

Wherein, the configuration information is used to forward information ofthe second UE at the first UE.

Wherein, the configuration information includes at least one of thefollowings:

an identity of the second UE, RNTI information of the second UE,physical downlink control channel configuration information of thesecond UE, physical downlink control channel configuration informationof the first UE, shared channel configuration information of the firstUE, and shared channel configuration information of second UE;

wherein, the physical downlink control channel configuration informationincludes at least one of the followings: a physical downlink controlchannel search space type, a maximum repetition number Rmax, a startingsubframe, an offset, valid subframes, a DCI format, and a physicaldownlink control channel resource configuration information;

the shared channel configuration information includes at least one ofthe followings: configuration information of the physical uplink sharedchannel, configuration information of the physical downlink sharedchannel, transmission mode of the shared channel, reference signalinformation, uplink valid subframes, downlink valid subframes, and HARQprocess parameters and a control region size within subframe.

The transmitting module 3101 is specifically configured to transmit thecontrol information and data information of the second UE to the secondUE through the first UE according to the configuration information.

The transmitting module 3101 is further specifically configured totransmit the control information to the second UE, and transmit the datainformation of the second UE to the second UE through the first UEaccording to the configuration information.

The second receiving module 3102 is specifically configured to transmitthe control information of the second UE to the second UE through thefirst UE according to the configuration information, and receive thedata information of the second UE that is forwarded by the first UE.

The second receiving module 3102 is further specifically configured totransmit control information to the second UE by the base stationaccording to the configuration information, and receive data informationof the second UE that is forwarded by the first UE.

The transmitting module 3101 is further specifically configured totransmit the second scheduling information and the first schedulinginformation to the first UE on the physical downlink control channel ofthe second UE and/or the physical downlink control channel of the firstUE according to the configuration information.

Wherein, the first scheduling information is used for the first UE toreceive the data information of the second UT, and the second schedulinginformation is used for the first UE to forward the data information ofthe second UE.

The transmitting module 3101 is further specifically configured totransmit the data information of the second UE to the second UE throughthe first UE based on the second scheduling information and the firstscheduling information.

The transmitting module 3101 is further specifically configured totransmit the control information of the second UE to the second UEthrough the first UE on the physical downlink control channel of thefirst UE and/or the physical downlink control channel of the second UEaccording to the configuration information.

The second receiving module 3102 is further specifically configured totransmit the second scheduling information and the first schedulinginformation to the first UE on the physical downlink control channel ofthe second UE and/or the physical downlink control channel of the firstUE according to the configuration information.

Wherein, the first scheduling information is used for indicating thereception of the shared channel of the second UE, and the secondscheduling information is used for the first UE to forward the datainformation of the second UE.

The second receiving module 3102 is further specifically configured toreceive the data information of the second UE that is forwarded throughthe first UE based on the second scheduling information and the firstscheduling information.

The embodiment of the present disclosure provides a base station.Compared with the prior art, the base station in the embodiment of thepresent disclosure transmits the configuration information to the firstUE, and then the base station transmits the information of the second UEto the second UE through the first UE according to the configurationinformation; and/or, the base station receives the information of thesecond UE that is forwarded by the first UE according to theconfiguration information, wherein the configuration information is usedto forward the information of the second UE at the first UE, (secondUE).

A further embodiment of the present disclosure provides a first UE,including: a processor; and a memory configured to store machinereadable instructions, wherein the instructions that, when executed bythe processor, cause the processor to perform the method of relaytransmission.

Yet another embodiment of the present disclosure provides a basestation, including: a processor; and a memory configured to storemachine readable instructions that, when executed by the processor,cause the processor to perform the method of relay transmission.

FIG. 32 schematically illustrates a block diagram that a computingsystem that can be used to implement a base station or user equipment ofthe present disclosure according to an embodiment of the presentdisclosure.

As shown in FIG. 32, a computing system 3200 includes a processor 3210,a computer readable storage medium 3220, an output interface 3230, andan input interface 3240. The computing system 3200 can perform themethod described above with reference to FIG. 15 or FIG. 16 to configurea reference signal and perform data transmission based on the referencesignal.

Specifically, the processor 3210 can include, for example, ageneral-purpose microprocessor, an instruction set processor, and/or arelated chipset and/or a special-purpose microprocessor (e.g., anapplication specific integrated circuit (ASIC)), and the like. Theprocessor 3210 may also include an onboard memory for caching purposes.The processor 3210 may be a single processing unit or multipleprocessing units for performing different actions of the method flowdescribed with reference to FIG. 15 or FIG. 16.

Computer readable storage medium 3220, for example, can be any mediumthat can contain, store, transfer, propagate, or propagationinstructions. For example, a readable storage medium may include, but isnot limited to, an electronic, magnetic, optical, electromagnetic,infrared, or semiconductor system, apparatus, device, or propagationmedium. Specific examples of the readable storage medium include: amagnetic storage device such as a magnetic tape or a hard disk (HDD); anoptical storage device such as a compact disk (CD-ROM); a memory such asa random-access memory (RAM) or a flash memory; and/or a wired/wirelesscommunication link.

The computer readable storage medium 3220 can include a computerprogram, which can include code/computer executable instructions that,when executed by the processor 3210, cause the processor 3210 toperform, for example, the method flow described above with reference toFIG. 15 or FIG. 16, and any variations thereof.

The computer program can be configured to have, for example, computerprogram code including a computer program module. For example, in anexample embodiment, the code in a computer program can include one ormore program modules, including, for example, module 1, module 2,

It should be noted that the division manner and number of modules arenot fixed, and those skilled in the art may use suitable program modulesor program module combinations according to actual situations. Whenthese program module combinations are executed by the processor 3210,the processor 3210 can perform the method flow, for example, describedabove with reference to FIG. 15 or FIG. 16, and any variations thereof.

According to an embodiment of the present disclosure, the processor 3210may use the output interface 3230 and the input interface 3240 toperform the method flow described above with reference to FIG. 15 orFIG. 16 and any variations thereof.

FIG. 33 is a diagram illustrating a device 1000 according to anotherembodiment of the present disclosure.

Referring to the FIG. 33, the device 1000 may include a processor 1010,a transceiver 1020 and a memory 1030. However, all of the illustratedcomponents are not essential. The device 1000 may be implemented by moreor less components than those illustrated in FIG. 33. In addition, theprocessor 1010 and the transceiver 1020 and the memory 1030 may heimplemented as a single chip according to another embodiment.

The aforementioned components will now be described in detail.

The processor 1010 may include one or more processors or otherprocessing devices that control the proposed function, process, and/ormethod. Operation of the device 1000 may be implemented by the processor1010.

The transceiver 1020 may include a RF transmitter for up-converting andamplifying a transmitted signal, and a RF receiver for down-converting afrequency of a received signal. However, according to anotherembodiment, the transceiver 1020 may be implemented by more or lesscomponents than those illustrated in components.

The transceiver 1020 may be connected to the processor 1010 and transmitand/or receive a signal. The signal may include control information anddata. In addition, the transceiver 1020 may receive the signal through awireless channel and output the signal to the processor 1010. Thetransceiver 1020 may transmit a signal output from the processor 1010through the wireless channel.

The memory 1030 may store the control information or the data includedin a signal obtained by the device 1000. The memory 1030 may beconnected to the processor 1010 and store at least one instruction or aprotocol or a parameter for the proposed function, process, and/ormethod. The memory 1030 may include read-only memory (ROM) and/or randomaccess memory (RAM) and/or hard disk and/or CD-ROM and/or DVD and/orother storage devices.

The embodiment of the present disclosure provides a first UE. Comparedwith the prior art, the first UE in the embodiment of the presentdisclosure receives configuration information transmitted by a basestation, wherein the configuration information is used to receiveinformation of the second UE, and receives the information of the secondUE according to the configuration information, then forwards thereceived information of the second UE, so that the relay transmissioncan be performed between the base station and the remote node (secondUE) through the relay node (first UE).

The embodiment of the present disclosure provides a base station.Compared with the prior art, the base station base station in theembodiment of the present disclosure transmits configuration informationto the first UE, and then the base station transmits information of thesecond UE to the second UE by using the first UE according to theconfiguration information; and/or, the base station receives theinformation of the second UE that is forwarded by the first UE accordingto the configuration information, wherein the configuration informationis used to forward the information of the second UE at the first UE, sothat the relay transmission can be performed between the base stationand the remote node (second UE) through the relay node (first UE).

It should be understood by those skilled in the art that the presentdisclosure involves devices for carrying out one or more of operationsas described in the present disclosure. Those devices can be speciallydesigned and manufactured as intended, or can comprise well knowndevices in a general-purpose computer. Those devices have computerprograms stored therein, which are selectively activated orreconstructed. Such computer programs can be stored in device (such ascomputer) readable media or in any type of media suitable for storingelectronic instructions and respectively coupled to a bus, the computerreadable media include but are not limited to any type of disks(including floppy disks, hard disks, optical disks, CD-ROM and magnetooptical disks), ROM (Read-Only Memory), RAM (Random Access Memory),EPROM (Erasable Programmable Read-Only Memory), EEPROM (ElectricallyErasable Programmable Read-Only Memory), flash memories, magnetic cardsor optical line cards. In other words, the readable media comprise anymedia storing or transmitting information in a device (for example,computer) readable form.

It should be understood by those skilled in the art that computerprogram instructions can be used to realize each block in structurediagrams and/or block diagrams and/or flowcharts as well as acombination of blocks in the structure diagrams and/or block diagramsand/or flowcharts. It should be understood by those skilled in the artthat these computer program instructions can be provided to generalpurpose computers, special purpose computers or other processors ofprogrammable data processing means to be implemented, so that solutionsdesignated in a block or blocks of the structure diagrams and/or blockdiagrams and/or flow diagrams are executed by computers or otherprocessors of programmable data processing means.

It should be understood by those skilled in the art that the steps,measures and solutions in the operations, methods and flows alreadydiscussed in the present disclosure may be alternated, changed, combinedor deleted. Further, other steps, measures and solutions in theoperations, methods and flows already discussed in the presentdisclosure can also be alternated, changed, rearranged, decomposed,combined or deleted. Further, the steps, measures and solutions of theprior art in the operations, methods and operations disclosed in thepresent disclosure can also be alternated, changed, rearranged,decomposed, combined or deleted.

What is described in the foregoing are only embodiments of the presentdisclosure, and should not be construed as limitations to the presentdisclosure. Any changes, equivalent replacements, modifications madewithout departing from the scope and spirit of the present disclosureare intended to be included within the protecting scope of the presentdisclosure.

What is claimed is:
 1. A method of monitoring a paging by a userequipment (UE), the method comprising: receiving configurationinformation including time domain information of indication information,from a base station; identifying time gap between a time position wherethe UE starts to monitor a first physical downlink control channel(PDCCH) for detection of the indication information and a paging framewhere the UE starts to monitor a second PDCCH, based on the time domaininformation; monitoring the first PDCCH for detecting the indicationinformation based on the identified time gap; and monitoring the secondPDCCH, based on the indication information detected via the first PDCCH.2. The method of claim 1, wherein the time domain information includesinformation regarding a number of frames between a frame, in which thetime position where the UE starts to monitor the first PDCCH is locatedand the paging frame.
 3. The method of claim 2, wherein the time domaininformation further includes information regarding a number of symbolsbetween the time position where the UE starts to monitor the first PDCCHand a start of the frame in which the time position is located.
 4. Themethod of claim 1, wherein the UE is in an idle state.
 5. The method ofclaim 1, wherein the indication information includes informationindicating whether a subset of UEs of a plurality of UEs need to monitora second PDCCH corresponding to the subset of UEs.
 6. A method ofperforming a paging by a base station (BS), the method comprising:transmitting configuration information including time domain informationof indication information, to a user equipment; identifying time gapbetween a time position where the UE starts to monitor a first physicaldownlink control channel (PDCCH) for detection of the indicationinformation and a paging frame where the UE starts to monitor a secondPDCCH, based on the time domain information; and transmitting theindication information via the first PDCCH based on the identified timegap, wherein the second PDCCH is monitored, based on the indicationinformation detected via the first PDCCH.
 7. The method of claim 6,wherein the time domain information includes information regarding anumber of frames between a frame, in which the time position where theUE starts to monitor the first PDCCH is located and the paging frame. 8.The method of claim 7, wherein the time domain information furtherincludes information regarding a number of symbols between the timeposition where the UE starts to monitor the first PDCCH and a start ofthe frame in which the time position is located.
 9. The method of claim6, wherein the UE is in an idle state.
 10. The method of claim 6,wherein the indication information includes information indicatingwhether a subset of UEs of a plurality of UEs need to monitor a secondPDCCH corresponding to the subset of UEs.
 11. A user equipment (UE)monitoring a paging, the UE comprising: a transceiver; and a processorcoupled with the transceiver and configured to: receive configurationinformation including time domain information of indication information,from a base station, identify time gap between a time position where theUE starts to monitor a first physical downlink control channel (PDCCH)for detection of the indication information and a paging frame where theUE starts to monitor a second PDCCH, based on the time domaininformation, monitor the first PDCCH for detecting the indicationinformation based on the identified time gap, and monitor the secondPDCCH, based on the indication information detected via the first PDCCH.12. The UE of claim 11, wherein the time domain information includesinformation regarding a number of frames between a frame, in which thetime position where the UE starts to monitor the first PDCCH is locatedand the paging frame.
 13. The UE of claim 12, wherein the time domaininformation further includes information regarding a number of symbolsbetween the time position where the UE starts to monitor the first PDCCHand a start of the frame in which the time position is located.
 14. TheUE of claim 11, wherein the UE is in an idle state.
 15. The UE of claim11, wherein the indication information includes information indicatingwhether a subset of UEs of a plurality of UEs need to monitor a secondPDCCH corresponding to the subset of UEs.
 16. A base station (BS)performing a paging, the BS comprising: a transceiver; and a processorcoupled with the transceiver and configured to: transmit configurationinformation including time domain information of indication information,to a user equipment, identify time gap between a time position where theUE starts to monitor a first physical downlink control channel (PDCCH)for detection of the indication information and a paging frame where theUE starts to monitor a second PDCCH, based on the time domaininformation, and transmit the indication information via the first PDCCHbased on the identified time gap, wherein the second PDCCH is monitored,based on the indication information detected via the first PDCCH. 17.The BS of claim 16, wherein the time domain information includesinformation regarding a number of frames between a frame, in which thetime position where the UE starts to monitor the first PDCCH is locatedand the paging frame.
 18. The BS of claim 17, wherein the time domaininformation further includes information regarding a number of symbolsbetween the time position where the UE starts to monitor the first PDCCHand a start of the frame in which the time position is located.
 19. TheBS of claim 16, wherein the UE is in an idle state.
 20. The BS of claim16, wherein the indication information includes information indicatingwhether a subset of UEs of a plurality of UEs need to monitor a secondPDCCH corresponding to the subset of UEs.